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Las especies invasoras son especies no autóctonas que se propagan de forma agresiva y alteran el medio ambiente.

Las especies no autóctonas que dañan los hábitats del noroeste del Pacífico incluyen especies invasoras de insectos, gusanos y plantas.

Barrenador esmeralda del fresno, gusanos saltarines y escarabajo japonés (se sabe que se encuentran en el noroeste del Pacífico)
Emerald ash borer on penny

Howard Russell, Michigan State University, Bugwood.org

Emerald ash borer adults are a bright, metallic green. When their wings are open a metallic red body is visible. The slender body is pointed at the end, and 1/3-1/2 inches (7.5 to 13.5 mm) long. EAB live for a short time and are active from June through July.

Adult emerald ash borer beside D-shaped exit hole in bark

Jared Spokowsky, Indiana Department of Natural Resources, Bugwood.org

Adult emerald ash borers exit the tree in late May / June. They leave D-shaped exit holes about 1/8-inch (3mm) in diameter in the bark.

Emerald ash borer larvae in tree bark

David Cappaert, Bugwood.org

Larvae are 1 to 1 1/3 inches (2.6 to 3.2 cm) long, creamy white, with bell-shaped segments. They are found under bark throughout the year. They cause damage to the tree by eating tissue beneath the bark.

Galleries visible in tree with bark pulled away

Edward Czerwinski, Ontario Ministry of Natural Resources, Bugwood.org

Emerald ash borer larvae feed on the cambium under the bark of the tree. They tunnel curving S-shaped galleries that can girdle and kill the tree.

Emerald Ash Borer (EAB)

Agrilus planipennis

Emerald ash borer is an invasive insect that damages ash trees (Fraxinus spp.). It can devastate ash tree populations in landscapes and natural areas. The larvae damage trees by eating plant tissue below the bark. Adults emerge from trees through “D”-shaped exit holes in the bark.

Emerald Ash Borer in Oregon

In July 2022 emerald ash borers were detected in Washington County, Oregon. See a press release  (Oregon Department of Agriculture). Oregon ash (Fraxinus latifolius) is an important riparian tree species in Oregon.

How to Identify Emerald Ash Borer

Adult insects are 0.3 to 0.5 inch long, slender, and metallic olive to emerald green. They are active June through July. Larvae are 1 to 1.3 inches long, creamy white, with bell-shaped segments. Pupa and larvae are found under the bark of ash trees throughout the year.

Be Alert and Report Sightings

Learn how to recognize ash trees and emerald ash borers and how to report a sighting. See emerald ash borer resources (OSU Extension Service).

Jumping worms compared to ruler

Njh5880, CC BY-SA 4.0, via Wikimedia Commons

The first thing most people notice about jumping worms is that they thrash wildly and irregularly. They have a large and distinct mouth.
They are red/brown/purple with iridescence, and 2.75 to 6.3 inches (70-160 mm) long. Their bodies can have 63-100 segments.
Stiff bristles called “setae” encircle each segment.

Jumping worm showing pale clitellum band (cropped)

"Amynthas" by Erin E. is licensed under CC BY 4.0 

The “clitellum” is a pale, smooth band a few segments behind the head end. It completely encircles the worm and is flush with the body.
Body segments between the head and clitellum are raised.

Barren, granular soil

Jumping worm excrement (poop) accumulates in the top few inches of soil. It is hard and granular, resembling coffee grounds. The granules repel water. They make the soil very porous and unable to hold water and nutrients.

Small cocoons next to a ruler

Marie Johnston, UW-Madison Arboretum, permission request needed

Cocoons are very tiny, 1/12 to 1/6 inches (2 to 4 mm) and similar in color to dirt. They overwinter, then hatch in spring. They can survive for several years and hatch during a wet spring. Cocoons can be transported in soil, mulch, mud on shoes, etc.

Jumping Worms

Amynthas agrestis + Amynthas tokioensis + Metaphire hilgendorfi

Jumping worms are invasive earthworm species of concern. Most earthworm species benefit the soil. Jumping worms eat through organic matter in soils rapidly compared to other species. Their activities degrade the forest litter layer at alarming rates. They create coarse granules that clump together and repel water. Jumping worms have erratic jumping movements as shown in the video.

Amynthas agrestis jumping movement
John Abrams, CC BY 4.0, via Wikimedia Commons

Jumping Worms in Oregon

Jumping worms are a new invasive species in the Pacific Northwest. See this publication on jumping worm identification and resources  (PDF). Also learn how to avoid spreading invasive species in plant sales or swaps  (OSU Extension Service).

If you suspect you’ve seen jumping worm, report it to the Oregon Invasive Species Hotline  or call  1-866-468-2337 (1-866-INVADER).

Japanese beetle adult

David Cappaert, Bugwood.org

Japanese beetle adults are oval and a little less than a half-inch long. They have a green metallic head and bronze-brown metallic wing covers.

Japanese beetle adult with white tufts

Adult beetles have white tufts of hair located along each side of the abdomen and rear.

Japanese beetles feeding on a rose flower

Japanese beetle adults feed on flowers and leaves of hundreds of plant species. They are often found in large groups feeding on plants.

Japanese beetle larvae

David Cappaert, Bugwood.org

Japanese beetle grubs are curved, creamy white with dark ends. They look like many other insect grubs found in soil.

Lawn damaged by Japanese beetle larvae

M.G. Klein, USDA Agricultural Research Service, Bugwood.org

Grubs feed on turf grass, and many landscape and garden plants. They damage large areas of turf grass. Japanese beetle is the most widespread turf grass pest in the United States.

Japanese Beetle

Popillia japonica

This invasive insect threatens the Pacific Northwest. Adults and larvae damage many different plants in lawns, landscapes, farms, and natural areas.

Japanese Beetle in Oregon

See Japanese Beetle PDX  (Oregon Department of Agriculture). The ODA has been actively working since 2017 to eradicate Japanese beetle where it has been found. 

How to Identify Japanese Beetle

Adult beetles are oval and a little less than a half-inch long. They have a green metallic head and bronze-brown metallic wing covers. They have white tufts of hair located along each side of the abdomen and rear. They feed on many kinds of plants and may skeletonize leaves.

Be Alert and Report Sightings

If you think you have spotted Japanese beetles and live outside the Oregon Department of Agriculture’s treatment area, Email Japanese.beetle@oda.Oregon.gov or call 503-986-4636 or 1-866-INVADER. 

Chinche apestosa marrón jaspeada adulta

Steven Valley, Oregon Department of Agriculture, Bugwood.org

Los adultos miden aproximadamente 5/8 de pulgada de largo y son de color marrón jaspeado. Las características que los identifican son:

  • Bandas blancas distintivas en las antenas oscuras.
  • Margen liso en el borde frontal de los “hombros”.
  • Bandas blancas en los costados de las alas.
  • Bandas blancas en las patas.
  • Emiten un fuerte olor parecido al del cilantro cuando se los molesta o se los aplasta.
Ninfas recién nacidas

David R. Lance, USDA APHIS PPQ, Bugwood.org

Las ninfas inmaduras de BMSB mudan cinco veces a medida que maduran y se convierten en adultas. Cada muda se denomina “estadio”. El estadio n.° 1 (recién nacido) es negro con marcas de color rojo amarillento en el abdomen.

Ninfas inmaduras

David R. Lance, USDA APHIS PPQ, Bugwood.org

Las ninfas crecen con cada estadio. Los estadios más avanzados tienen manchas rectangulares en la parte posterior del abdomen. Todos los estadios tienen un margen espinoso en el borde frontal de los “hombros”.

Racimo de huevos

Susan Ellis, Bugwood.org

Los huevos se ponen en grupos que varían en número entre 25 y 30 huevos. Tienen forma de barril y son de color blanco a verde pálido. Tienen espinas cortas que rodean la parte superior y están adheridos al envés de las hojas.

Chinche apestosa marrón jaspeada

Halyomorpha halys

La chinche apestosa marrón jaspeada (BSMB) es una plaga invasora de los cultivos. Se alimenta de muchas plantas y causa daños, incluidos los cultivos de hortalizas y frutas. La BMSB representa una amenaza importante para la agricultura en el noroeste del Pacífico.

La chinche apestosa marrón jaspeada en Oregón

La BMSB se descubrió en Portland en 2004 y en Vancouver, Washington, en 2010. Ahora está muy extendida en el oeste de Oregón y Washington. La avispa samurái parásita (Trissolcus japonicus) se ha introducido ampliamente y está proporcionando cierto control.

Cómo identificar la chinche apestosa marrón jaspeada

Las chinches apestosas marrones jaspeadas adultas son insectos de color marrón jaspeado, con forma de escudo, de aproximadamente 5/8 pulgadas de largo. Tienen bandas blancas distintivas en las antenas oscuras, las patas y los costados de las alas. Pueden migrar a sus viviendas en el invierno. Emiten un olor a cama cuando se los molesta.

Esté alerta e informe los avistamientos en áreas nuevas

La BSMB ya está presente en Oregón. Si cree que la ha visto en una nueva área, infórmelo a la línea directa de especies invasoras de Oregón al: 1-866-INVADER (1-888-468-2337) o use su formulario de informe en línea.

Escarabajo de cuernos largos y mosca linterna moteada (no se sabe que existan en el noroeste del Pacífico)
Longhorned beetle adult

Steven Valley, Oregon Department of Agriculture, Bugwood.org

Longhorned Beetle

Anoplophora glabripennis

Longhorned beetle is an invasive insect species that poses a threat to hardwood trees in North America. The larvae (right) burrow underneath trees’ bark and cause significant damage. The larvae leave a large hole as they exit the bark of the tree.

Longhorned Beetle in Oregon

It is not known to occur in the Pacific Northwest, but the habitat will likely support this invasive insect. See Pest Watch—Longhorned Beetle (OSU Extension Service) for details.

If you suspect you’ve seen longhorned beetle, report it to the Oregon Invasive Species Hotline  or call  1-866-468-2337 (1-866-INVADER).

Spotted lanternfly adult

Lawrence Barringer, Pennsylvania Department of Agriculture, Bugwood.org

Spotted lanternfly is a plant-hopper insect. It is native to parts of Asia. Adults fold their wings over their back like a tent as shown in the photo.

Spotted lanternfly group

Richard Gardner, Bugwood.org

Adults and immature insects (nymphs) often cluster together on plants.

Honeydew on leaves

Lawrence Barringer, Pennsylvania Department of Agriculture, Bugwood.org

Spotted lanternfly nymphs and adults feed on the sap of plants. The plants exude a sticky honeydew on the leaves. Honeydew is a sign of leaf-feeding insects such as spotted lanternfly.

Spotted lanternfly nymph

The nymphs have distinctive color patterns. The photo shows a nearly mature nymph with black-and-red color and white spots. The younger nymphs are black with white spots (not shown).

Spotted lanternfly eggs

Females lay eggs in clusters with 4-7 columns as shown in the photo.

Spotted lanternfly nymphs on tree-of-heaven

The photo shows spotted lantern fly nymphs on tree-of-heaven, which is a preferred food source of the insect.

Spotted Lanternfly

Lycorma delicatula

Spotted lanternfly is an invasive insect species. Nymphs and adults cause feeding damage to many different plants in landscapes, farms, and natural areas. Its preferred food source is tree-of-heaven (a common invasive plant species in the Pacific Northwest). See How to Get Rid of Tree-of-Heaven.

Spotted Lanternfly in Oregon

The spotted lanternfly is not known to occur in the Pacific Northwest, but the habitat will likely support this invasive insect. See Pest Alert: Spotted Lanternfly is an Invasive Insect That May Impact Oregon (OSU Extension Service).

If you suspect you’ve seen spotted lanternfly, please report it to pestreport@oda.state.or.us  (Oregon Department of Agriculture).

Especies de plantas invasoras en el noroeste del Pacífico (pastos y plantas similares a los pastos)
Mano enguantada sosteniendo flores de hierba tramposa

La hierba de trigo germina y crece durante el otoño, el invierno y la primavera si hay suficientes precipitaciones. Las plantas crecen hasta una altura de entre 10 y 75 cm, según la humedad y la fertilidad del suelo.

Flores de hierba tramposa

La hierba de la trampa florece en primavera. Las flores son pequeñas y crecen en racimos peludos (inflorescencias) que miden de 3 a 9 pulgadas de largo. Las flores se vuelven de un color marrón rojizo como se muestra en la foto.

Semillas de hierba tramposa

Howard F. Schwartz, Colorado State University, Bugwood.org

Las plantas individuales de pasto de trigo pueden producir de docenas a cientos de semillas. La mayoría de las semillas germinan el otoño siguiente y permanecen viables en el suelo hasta por 5 años.

Las semillas se adhieren a los zapatos, la ropa y las mascotas y se transportan fácilmente a nuevas áreas.

Tallos y hojas de hierba tramposa

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Las láminas de las hojas son estrechas y miden hasta 0,2 pulgadas de ancho.

Tallo de hierba tramposa

Las plantas desarrollan de 2 a 20 tallos que tienen pelos suaves y cortos en la mitad inferior del tallo (vaina de la hoja).

Hierba tramposa

Bromus tectorum

La hierba de la cebada es una maleza herbácea dominante en el oeste intermontano. Completa su ciclo de vida en una sola temporada de crecimiento (anual). La hierba de la cebada se propaga rápidamente por semillas y forma densas plantaciones. Aumenta el riesgo de incendio y sus flores pueden dañar a las mascotas. Tome medidas para controlar la hierba de la cebada.

Planta de bromo falso

Michelle Delepine, West Multnomah Soil & Water Conservation District

El falso bromo germina a finales de otoño y en primavera. Las plantas maduran y forman racimos compactos de hojas de color verde brillante durante la primavera, el verano y el otoño. Las plantas permanecen verdes en temperaturas invernales suaves y, en algunos lugares con inviernos más fríos, las hojas y los tallos mueren y se convierten en paja blanca.

Falsa lámina de hoja de bromo

"brachypodium sylvaticum" by Miguel Porto is licensed under CC BY-NC 4.0.

Las plantas individuales de bromo falso producen de docenas a cientos de semillas. Las semillas se propagan por medio de animales, personas o equipos que se desplazan por áreas infestadas. La mayoría de las semillas germinan en un año o dos.

Flores de bromo falso

Flores de bromo falso en verano. Los grupos de flores crecen en espiguillas colgantes de color verde pálido que están unidas directamente al tallo floral. Las espiguillas miden entre 1 y 2 pulgadas de largo. Hay entre 5 y 10 espiguillas por tallo floral, como se muestra en la foto. Cada espiguilla tiene entre 7 y 17 flores individuales.

Bromo falso en el claro del bosque

El bromo falso se está expandiendo rápidamente en bosques de dosel cerrado, bosques arbolados, sabanas de robles, pastizales, senderos al costado de las carreteras y áreas alteradas.

Degrada el hábitat al suprimir el crecimiento del sotobosque de las plantas nativas.

Mapa de Oregón que muestra la distribución del falso bromo

Distribución y denuncia de bromo falso

Las áreas en rojo muestran los condados de Oregón donde el bromo falso está muy extendido. Las áreas en amarillo muestran los condados donde tiene una distribución limitada. No se sabe si se encuentra en las áreas grises.

Denuncias en Oregón

Puede ayudar a las agencias de Oregón a rastrear la distribución de especies invasoras.

Si tiene bromo falso creciendo en su propiedad, infórmelo a la línea directa de especies invasoras de Oregón. Llame al 1-866-INVADER (1-866-468-2337). O utilice su formulario de denuncia en línea.

Bromo falso

Brachypodium sylvaticum

El falso bromo es una maleza herbácea invasiva, de larga vida (perenne). Esta gramínea se propaga rápidamente por semillas y forma densas matas que inhiben a otras plantas. El falso bromo se está expandiendo rápidamente en una variedad de hábitats en el noroeste del Pacífico. Tome medidas para denunciarlo y controlarlo.

Jubatagrass infestation

Jubatagrass grows in moist, cool coastal areas. It is found in dunes, drainage ditches, roadsides, cut slopes, forestry operations, and disturbed areas.

Jubatagrass leaves

Mature leaves are 0.8-1.2 inches wide and grow 3-6 feet above the ground. Bright-green leaves ascend and spread horizontally compared to pampasgrass. The blades are flatter and less coiled compared to pampasgrass.

Jubatagrass immature flowering plumes

Immature jubatagrass flowering plumes are deep violet and can grow 3-6 feet above leaves. Plumes occur in late summer-early fall.

Jubatagrass mature plumes and flowers

Mature jubatagrass flowering plumes fade to pinkish or tan color. Jubatagrass flowers are effectively all female; however, plants produce viable seeds. Each jubatagrass flowering plume can create roughly 100,000 seeds. An individual plant creates millions of seeds yearly. Seeds are less than 0.1 inches long and are dispersed on air currents, animals, clothes, and equipment.

Cortaderia seedling

Seeds live less than six months and require moist bare ground in spring to germinate and grow new plants. Seedlings compete poorly with native plants in shady conditions.

Jubatagrass root crown

Mature jubatagrass forms a robust root system that often needs heavy equipment to remove.

Pampassgrass plants in landscape

Cortaderia selloana" by Flowersabc is licensed under CC BY-SA 2.0

Pampasgrass is often grown in landscapes. In comparison to jubata grass, pampasgrass plants grown in landscapes don’t always create viable seeds. If you have pampasgrass in your landscape, look for new seedlings in bare-ground areas. If you don’t see new seedlings, then you can leave the plants alone. If you do see new seedlings, then remove the pampasgrass plants from your landscape.

Pampasgrass flowering plumes

Immature female pampasgrass flowering plumes are white and grow 0-3 feet above leaves. The male flowering plumes are white-violet and grow 0-6 feet above leaves. Plumes occur midsummer-early fall. The immature plumes of jubata grass are violet-colored in comparison.

 

Pampasgrass stand growing in inland site

When both male and female pampasgrass flower heads grow together, they form viable seeds. In this case, it spreads to new areas, which makes it an invasive plant species. Pampasgrass grows in moist, cool coastal areas. It tolerates a wider range of cool and warm temperatures compared to jubatagrass. Pampasgrass grows in the increased sunlight intensity and drought found at inland sites. It is found in dunes, drainage ditches, roadsides, cut slopes, forestry operations, and disturbed areas.

Map of Oregon showing jubatagrass distribution

Jubatagrass Distribution & Reporting

Red areas show Oregon counties where jubatagrass is widespread. Yellow areas shows counties where it has limited distribution. Gray areas show counties where it is not known to occur.

Report Invasive Species

You can help Oregon agencies track the distribution of invasive species.

If you observe an infestation of jubatagrass or pampasgrass on your property, please report it to the Oregon Invasive Species Hotline. Call 1-866-INVADER (1-866-468-2337). Or use their online reporting form.

Jubatagrass & Pampasgrass

Cortaderia jubata, C. selloana

These large, invasive, long-lived (perennial) grasses have saw-like leaf blades. They grow dense bunches of leaves 3–13 feet tall and tall flower plumes. These grasses are spreading rapidly in coastal areas. Take action to report and control them.

Invasive Plant Species in the Pacific Northwest (woody trees, shrubs / bushes & vines)
Mature boom plants with yellow flowers

Weston Miller, Oregon State University

Mature broom shrubs are three to ten feet tall with dense, slender stems and yellow flowers. Many broom shrubs often grow together.

Yellow pea family flowers

The flowers are yellow and about 1 inch long, and typical of many plants in the pea family.

Broom growing on road cut

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Broom species are nitrogen-fixing plants. This trait helps broom grow in areas with poor quality and disturbed soils.

Broom seed pods

Seed pods (fruits) are hairy along the seam and turn from green to brown as they dry.

Broom seed illustration

A mature Scotch broom plant produces about fifteen thousand seeds per year. The seeds remain viable in the soil for ten or more years.

Map of Oregon showing Scotch distribution

Scotch Broom Distribution & Reporting in Oregon

Red shows counties in Oregon where Scotch broom is widespread. Yellow shows counties where it has limited distribution. Green shows an area where Scotch broom has been eliminated. Grey areas show counties where it is not known to occur.

Reporting Invasive Species

You can help Oregon agencies track the distribution of invasive species.

If you know about an infestation of Scotch broom, please report it to the Oregon Invasive Species Hotline. Call 1-866-INVADER (1-866-468-2337). Or use the online reporting form.

Broom

Cytisus scoparius + similar species

Scotch broom and related species are evergreen shrubs with bright yellow flowers. These pea-family shrubs fix nitrogen, which helps them to invade disturbed areas. Take action to control this invasive weed.

Butterfly bush infestation in a neglected urban area

Butterfly bush establishes in areas with disturbed soil. It grows along roads and riverbanks and in pastures and recently burned areas.

Butterfly bush growing out of a chimney

Butterfly bush grows in harsh conditions such as cracks in pavement and gravel roads. The photo shows a butterfly bush growing out of a chimney.

Butterfly bush leaves and flower spike

Butterfly bush’s leaves grow alternately along the stems. Leaves are 4-10 inches long and 1-3 inches wide. They are dark green on top and white-pale green underneath.

Flower spikes form at the tip of the branches. Flowers vary in color from white to purple and and blue. The flowers attract butterflies.

Mature butterfly bush flower heads

Forest and Kim Starr, Starr Environmental, Bugwood.org

Butterfly bush spreads via seeds. Seeds can form during its first year. They are viable for 3 to 5 years.

Butterfly Bush

Buddleja davidii

Butterfly bush is a common landscape shrub with attractive flower spikes. It spreads aggressively to new areas by seeds and displaces native plants. Take action to control the invasive weed.

Flowering cherry laurel shrub in landscape

"Prunus laurocerasus" by wallygrom is licensed under CC BY-SA 2.0.

The photo shows a large, flowering cherry laurel shrub in a landscape.

Cherry laurel leaves and flowers

Leaves grow alternately on stems. They are leathery. The leaves are oval-shaped and 2-8 inches long. The underside of the leaves is lighter colored than the top. Flower clusters grow upright 2-5 inches tall. The white flowers have five petals.

Cherry laurel leaves and berries

Dark colored berries are about ½ inch wide. Birds eat the berries and spread the seeds.

Cherry Laurel

Prunus laurocerasus and P. lusitanica

English laurel (Prunus laurocerasus) and Portuguese laurel (P. lusitanica) are referred to as cherry laurel. Birds eat cherry laurel berries and carry seeds to new locations. Escaped cherry laurel plants are spreading from landscapes into natural areas and neglected sites. Take action to control this invasive weed.

Common hawthorn thicket

iStock

Common hawthorn grows 6-30 feet tall as a thorny, deciduous small tree or shrub. It often forms a thicket.

Common hawthorn leaf

Robert Vidéki, Doronicum Kft., Bugwood.org

Leathery leaves grow alternately on stems. They are 3-7 lobed, 1-2 inches long.
Flowers occur on short stems clustered in flat-topped groups of 10-20. Each flower has five sepals and five white petals that age to light pink.

Common hawthorn flowers and leaves

Common hawthorn flowers are white or pink with five petals. The flowers have a strong odor.

Common hawthorn thorns

The thorns of common hawthorn are large and dangerous. If you are injured by a thorn, clean the wound with soap and water.

Common hawthorn leaves and berries

Fruit is a ¼- to ½-inch round, and dark red to crimson that persists into late winter.
Birds eat the fruits and spread the seeds.

Common Hawthorn

Crataegus monogyna

Common Hawthorn was planted in landscapes and hedgerows. It is now spreading into natural areas and neglected sites. It has sharp thorns that cause injury. Take action to control this invasive plant.

English holly leaves with spines

English holly has waxy, evergreen leaves with spines along the edges. Wear thick gloves and clothing to handle holly plants. The spines hurt.

English holly leaves and red berries

Red holly berries are about 1/4 inch in diameter. Birds eat the berries and spread the seeds.

Holly cultivar with variegated leaves

John Ruter, University of Georgia, Bugwood.org

There are numerous cultivars of English holly with distinct traits. The photo shows a cultivar with variegated leaves.

English Holly

Ilex aquifolium

English holly is a common landscape plant used for hedges and screens. It grows 20–50 feet tall as a compact tree. Holly is also pruned as a hedge. Birds eat English holly berries and carry seeds to new locations. Escaped English holly plants are spreading from landscapes into natural areas and neglected sites. Take action to control its spread.

Gorse stem with spines and yellow flowers

Daria Trefilova, iStock

Mature gorse shrubs are three to ten feet tall with dense, slender stems and yellow flowers. Many gorse shrubs often grow together.

Gorse flowers on stem

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

The flowers are about one inch long and typical of many plants in the pea family.

Gorse stem with spines

Gorse spines are large and dangerous. If you are injured by a gorse spine, clean the wound with soap and water.

Gorse

Ulex europaeus

Gorse is an evergreen shrub (bush) with sharp thorns and bright-yellow flowers. These pea-family shrubs fix nitrogen, which helps them to invade disturbed areas. Take action to control this invasive weed.

Matorral de moras del Himalaya en una zona abandonada

La zarzamora del Himalaya ocupa zonas abandonadas. Las plantas viven muchos años (perennes). Los tallos crecen hasta 15 pies de altura. Crecen en el suelo o a través de la vegetación o estructuras.

Caña de zarzamora del Himalaya de color rojo con grandes espinas

Las espinas de la zarzamora del Himalaya son grandes y peligrosas. Si te hieres con una espina de zarzamora, limpia la herida con agua y jabón.

Frutos, hojas y tallos de la mora del Himalaya

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Las aves y los mamíferos comen las bayas y esparcen ampliamente las semillas.

Folleto de mora del Himalaya con cinco hojas

Las hojas tienen forma de palma y un tallo central. Cada hoja tiene cinco folíolos (a veces tres) con márgenes dentados.

Flor y hojas de mora del Himalaya

Las flores de la mora del Himalaya tienen cinco pétalos en tonos que van del blanco al rosa. Son muy atractivas para las abejas y otros polinizadores.

Mora del Himalaya

Rubus bifrons. R. armeniacus

La zarzamora del Himalaya es una planta invasora que crece en zonas naturales y abandonadas en todo el noroeste del Pacífico. Las cañas tienen espinas afiladas y forman matorrales densos. Tome medidas para controlar la zarzamora del Himalaya y limitar su propagación.

Indigo bush thicket

Robert Vidéki, Doronicum Kft., Bugwood.org

Indigo bush is a thornless shrub that loses its leaves in the winter (deciduous). Stems grow roughly 12 feet tall. Plants form dense thickets.

Indigo bush leaves with leaflets

Rebekah D. Wallace, University of Georgia, Bugwood.org

Leaves have a central stem with 13–25 leaflets arranged opposite each other along the stem. The leaflets are one to two inches long, dotted, and hairy.

Indigo bush flower stems and leaves

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Indigo bush blooms in May through June. Flowers are showy and lavender-colored. They are densely arranged on erect stems. Flowers are violet to purple with yellow anthers.

Indigo bush growing by water

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Indigo bush spreads by seed and runners from the root system. It thrives along waterways and prairie draws. It also grows along forest edges and rights-of-way.

Indigo bush seed pods

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Indigo bush seeds mature in small fruit pods. Each pod contains 1–2 seeds. The pods float in water to new locations.

Indigo Bush

Amorpha fruticosa

Indigo bush is an invasive woody shrub with lavender flowers. It spreads quickly to form dense thickets, especially near water. Take action to report and control this invasive plant and prevent its spread

Thick mat of ivy in landscape

Weston Miller, Oregon State University

Evergreen vine with waxy leaves. Forms a thick mat often growing over other plants.

Many angular ivy leaves

Forest and Kim Starr, Starr Environmental, Bugwood.org

Leaf shape and size vary on a single plant. When growing on the ground in vegetative growth stage, it has angular leaves with three to seven tips.

Many rounded ivy leaves

Weston Miller, Oregon State University

Leaves respond to direct or strong indirect sunlight. They become more round with a single tip.

Dense stand of ivy with berries

Birds eat ivy berries and carry seeds to new locations. The seeds sprout and new ivy plants grow.

Ivy stems spreading up tree

Single ivy plants grow vigorous root systems. Vines sprawl across the ground and grow up trees, shrubs, and structures as shown in the photo. New plants start from cut or broken pieces of ivy stems.

Map of Oregon showing English ivy distribution

English Ivy Distribution & Invasive Species Reporting in Oregon

Red areas show counties in Oregon where English ivy is widespread. Grey areas show where it is not known to occur.

Invasive Species Reporting

You can help Oregon agencies track the distribution of invasive species.

If you know about an infestation of ivy, please report it to the Oregon Invasive Species Hotline. Call 1-866-INVADER (1-866-468-2337). Or use their online reporting form.

Ivy

Hedera hibernica , H. helix , and H. colchica

Ivy grows vigorous evergreen vines. It takes over unmanaged landscapes, forests, and waste areas. Take action to keep ivy from spreading to new locations by limiting fruiting. Birds eat ivy berries and spread seeds to new locations.

Old man’s beard vines with leaves and seeds climbing tree

AnRo0002, CC0, via Wikimedia Commons

Old man’s beard vine with stringy bark

Robert Vidéki, Doronicum Kft., Bugwood.org

Old man’s beard seed structures in winter

"Clematis vitalba" by anro0002 is licensed under CC BY-SA 2.0.

Old Man’s Beard

Clematis vitalba

Old mans beard is a fast-growing, perennial (long-lived) climbing vine. Plants grow twenty feet or more in a single season and spread quickly over open ground. The vines engulf vegetation and structures and climb into the forest canopy to suppress native plant growth.

Whorled, glossy, evergreen leaves of spurge laurel

"Daphne laureola" by murray_dawson is licensed under CC BY 4.0.

Spurge laurel is an evergreen shrub. It grows 2 to 4 feet tall. It has dark green, shiny leaves that grow in dense whorls. Cut stems produce a strong odor.

Greenish-yellow flowers

Small greenish-yellow flowers grow in clusters underneath the leaves. Flowers form in late winter to early spring. Flowers are very fragrant.

Green unripe fruit

Robert Vidéki, Doronicum Kft., Bugwood.org

Green fruits form in the spring.

Spurge Laurel

Daphne laureola

Spurge laurel is an invasive evergreen shrub. It dominates an area when left unmanaged. All parts of spurge laurel are poisonous to people, pets, and livestock. Take action to control this invasive plant and prevent its spread.

Many tree-of-heaven stems growing in abandoned building foundation

Joseph M. DiTomaso, University of California - Davis, Bugwood.org

Tree-of-heaven is a fast-growing deciduous tree. It grows as a single tree or as many stems as shown in the photo.

Large tree-of-heaven leaf with leaflets

Karan A. Rawlins, University of Georgia, Bugwood.org

Leaves have a large central stem with leaflets arranged opposite each other along the stem. A single leaf is 1-3 feet long.

Tree-of-heaven fruits hanging on branch

Annemarie Smith, ODNR Division of Forestry, Bugwood.org

Established female trees produce hundreds of thousands of seeds each year. The seed forms inside clusters of samaras (seed pods). They remain on the tree through winter.

Textured bark of mature tree-of-heaven tree

Mature trees grow as a single trunk up to 100 feet tall. Bark is textured and colored shades of brown and grey as trees age.

Many tree-of-heaven stems in grassy area

Tree-of-heaven has an extensive root system, including shallow roots. The shallow roots produce many shoots that emerge far from the trunk of the established tree.

Tree-of-heaven distribution in Oregon

Tree-of-Heaven Distribution & Invasive Species Reporting in Oregon

The yellow areas on the map of Oregon show counties where tree-of-heaven has limited distribution. Grey areas show counties where it is not known to occur.

Invasive Species Reporting

You can help Oregon agencies track the distribution of invasive species.

If you know about an infestation of tree-of-heaven, please report it to the Oregon Invasive Species Hotline. Call 1-866-INVADER (1-866-468-2337). Or use their online reporting form.

Spotted lanternfly adult

INVASIVE SPECIES ALERT: Spotted Lantern Fly

This invasive insect feeds on tree-of-heaven and damages many agricultural crops. It is established in the Eastern United States. It is not known to occur in the Pacific Northwest at this time. Look for this insect pest and if you find it, report it. Learn more.

Tree-of-Heaven

Ailanthus altissima

Tree-of-heaven is an invasive tree that spreads quickly. It is very difficult to control. It grows an extensive root system, which produces new stems that emerge far away from the trunk of established trees. Take action to control tree-of-heaven.

Especies de plantas invasoras en el noroeste del Pacífico (herbáceas)
Hojas de ranúnculo rastrero

iStock

Flor de ranúnculo rastrero

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Ranúnculo rastrero

Ranunculus repens

El ranúnculo rastrero es una planta herbácea perenne (vive muchos años) con hojas y tallos suaves y flores amarillas. Es una maleza muy extendida en el noroeste del Pacífico, especialmente al oeste de las montañas Cascade.

Planta de mostaza de ajo en flor

Chris Evans, University of Illinois, Bugwood.org

Los tallos crecen de tres a cuatro pies de alto y de ancho. Las flores blancas se forman en la parte superior de los tallos en la primavera.

Rosetas de mostaza y ajo

Tom Heutte, USDA Forest Service, Bugwood.org

Las semillas germinan a fines del invierno o principios de la primavera y crecen en rosetas con hojas dentadas y en forma de riñón. Las plantas individuales viven en rosetas durante un año.

Flores y hojas de mostaza de ajo

Las plantas de ajo silvestre viven dos años. En la primavera de su segundo año, la planta desarrolla tallos y hojas triangulares con bordes dentados. Las hojas están dispuestas una frente a la otra a lo largo del tallo. En la parte superior de los tallos crecen flores blancas con cuatro pétalos.

Vainas de mostaza y ajo

La mostaza de ajo se propaga rápidamente por semillas. Las plantas más grandes y maduras producen hasta ocho mil semillas. Las semillas se forman en vainas estrechas a fines de la primavera. A fines de junio, las vainas de semillas se abren y esparcen las semillas.

Mostaza de ajo que crece en un bosque

La mostaza de ajo domina rápidamente áreas naturales como bosques húmedos y bosques secos, suprimiendo el crecimiento de plantas nativas. La pérdida de plantas nativas reduce el valor del hábitat de la zona.

Mapa de Oregón que muestra la distribución de la mostaza de ajo

Distribución y notificación de la mostaza de ajo en Oregón

El área roja del mapa muestra dónde está muy extendida la mostaza de ajo. Las áreas amarillas muestran los condados donde tiene una distribución limitada. Las áreas grises muestran los condados donde no se sabe que esté presente.

Notificación de especies invasoras

Puede ayudar a las agencias de Oregón a rastrear la distribución de especies invasoras.

Si sabe de una infestación de mostaza de ajo, infórmelo a la línea directa de especies invasoras de Oregón. Llame al 1-866-INVADER (1-866-468-2337). O utilice su formulario de denuncia en línea.

Mostaza de ajo

Alliaria petiolata

La mostaza de ajo es una planta herbácea invasora (de hojas y tallos suaves) que se propaga por semillas. Forma una densa vegetación y domina el sotobosque y los bordes del bosque. Tome medidas para controlar esta maleza invasora.

Giant hogweed flowers

Terry English, USDA APHIS PPQ, Bugwood.org

Have white, umbrella-like, flowerhead (umbels) that are 18-24 inches across

Hollow stem is covered with dark purple blotches, bumps and hairs

Stems are 2-4 inches in diameter and hollow. Have purplish-red blotches and bumps. Covered with stiff hairs.

Dense patch of giant hogweed plants before flowering

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Forms dense patches that emerge in later winter and spring. Stems die and remain standing late summer through early winter.

Giant Hogweed

Heracleum mantegazzianum

Giant hogweed plants often reach 10–12 feet tall. The white flowers grow 8–24 inches across. Leaves are 3–5 feet wide, coarsely toothed, with deeply cut leaflets. Giant hogweed sap on your skin or eyes causes severe burns when exposed to sunlight. Report this invasive species if you think you’ve found it on your property. Giant hogweed is an Early Detection Rapid Response species. An agency can help yo u control it on your property.

Plantas de arum italiano con tallos y hojas

Weston Miller, Oregon State University

Las plantas crecen entre 30 y 45 cm de alto. Las hojas tienen forma de flecha con una nervadura central y venas de color verde pálido.

Flor y hojas de arum italiano

"Arum italicum - Araceae" by Kerry  Woods is licensed under CC BY-NC-ND 2.0 (cropped).

Las flores son de color amarillo crema y tienen un olor desagradable. Tienen una espiga corta y una estructura grande, blanca y en forma de embudo.

Espigas de arum italiano con frutos verdes en suelo desnudo

Los frutos están agrupados en espigas. Pasan de ser verdes a ser de color rojo anaranjado y contienen semillas que los esparcen a nuevas áreas.

Raíces y tallos blancos expuestos en el suelo.

Los tallos se extienden por debajo de la superficie del suelo. Forma tubérculos y raíces de color blanco. Son difíciles de eliminar.

Densa mancha de arum italiano

El arum italiano forma densas áreas que son visibles desde el otoño hasta el invierno. En los meses cálidos y secos del verano, los tallos y las hojas se secan y no son visibles por encima del suelo.

Arum italiano

Arum italicum

Las plantas crecen entre 30 y 45 cm de alto. Las hojas tienen forma de flecha con nervaduras y nervios de color verde pálido. La arum italiana se escapó de los paisajes y se está extendiendo a nuevas áreas. Tome medidas para controlar esta maleza invasora.

Knotweed leaves and stems

David J. Moorhead, University of Georgia, Bugwood.org

The leaves grow opposite one another along the red stems.

Knotweed leaves and flower

Barbara Tokarska-Guzik, University of Silesia, Bugwood.org

Leaves grow as long as 15 inches and 11 inches in width. But leaves can be smaller, as shown in the photo.

Knotweeds plant with many flowers

Flowers are abundant in mid to late summer. They grow on branches in the top 1/3 of the plant. Flowers make seeds that result in new plants. But seedlings play a small role in establishing new stands.

Knotweed clump with many stems

Jan Samanek, Phytosanitary Administration, Bugwood.org

Stems are long, hollow, and segmented like bamboo. They grow from 4-15 feet tall and are often arched.

Knotweed root structure

John Cardina, The Ohio State University, Bugwood.org

Knotweed spreads far beyond shoot growth with underground root structures (rhizomes). Stems and root pieces broken or cut away from rooted plants can make new plants.

Knotweed stand with dead stems in dormant season

Barbara Tokarska-Guzik, University of Silesia, Bugwood.org

In the fall and winter, knotweed stems die and remain standing. New growth emerges from the soil in early spring.

Knotweed

Fallopia sachalinensis , F. x bohemica , F. japonica & Persicaria wallichii

Knotweeds are a group of related, invasive plant species. They are shrub-like, broadleaf plants that die back in the winter. Knotweed plants grow 4–15 feet tall each year. They have large, oval-to-heart-shaped leaves. Take action to report and control knotweed.

Densa mancha de celidonia menor con flores

Forma parches densos que son visibles a finales del invierno y en primavera. Los tallos que crecen sobre el suelo mueren y no son visibles durante el verano y el otoño.

Plantas de celidonia menor con raíces y tallos al lado de la regla

David L. Clement, University of Maryland, Bugwood.org

Las plantas crecen alrededor de 6 a 8 pulgadas de alto desde la base (roseta).

Flor amarilla con 8 sépalos amarillos.

Las flores amarillas tienen sépalos amarillos (se asemejan a los pétalos).

Bulbos pequeños y pálidos en tallos.

En los tallos se forman bulbos pequeños y pálidos (llamados bulbillos), que se adhieren a los zapatos, la ropa y el equipo. El agua que fluye los lleva a nuevas zonas.

 

Celidonia menor

Ficaria verna

La celidonia menor crece de 15 a 20 cm de alto. Tiene hojas de color verde oscuro con forma de corazón y flores amarillas. Se propaga rápidamente y domina una zona si no se controla. Tome medidas para controlar esta maleza invasora.

Poison hemlock leaves and stems 

Barry Rice, sarracenia.com, Bugwood.org

In the first year poison hemlock is a rosette of glossy-green leaves about 2-3 feet high. The leaves are smooth and hairless.

Poison hemlock stems with purple blotches

In spring of the second year of growth, established plants sprout hollow flowering stems. They display red-purple spots and have a sheath at the base of the side stems. They grow up to 12 feet tall. The plants have an unpleasant odor and toxic fluid when crushed.

Poison hemlock flowers

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Poison hemlock has white, umbrella-like flowerheads (umbels) that are 4-8 inches across.
 

Poison Hemlock

Conium maculatum

Poison hemlock is found throughout the Pacific Northwest. It grows in streams, ditches, roadsides, forest edges, and cultivated fields. Poison hemlock can dominate an area when left un-managed. All parts are poisonous for people, pets, and livestock. Control this plant in landscape and pasture areas. 

For more information about poison hemlock and livestock, see Poison hemlock and Western waterhemlock: deadly plants that may be growing in your pasture - OSU Extension Service

Common Pokeweed with red stems, green unripe berries

Weston Miller, Oregon State University

Pokeweed often matures into a shrub or small tree. But it is not woody and dies back with the onset of winter.

Red pokeweed stem

Karan A. Rawlins, University of Georgia, Bugwood.org

Stems grow two to eight feet each year from a white, fleshy root. They are colored green, red, or purple. The hollow stems are smooth and grow up to 4 inches across.

Pokeweed leaves

Each leaf is 5-20 inches long. The leaves are about one third as wide as they are long. They alternate along the stem. The leaves smell bad when crushed.

Dark-purple pokeweed berries

The flowers mature into green berries. In late summer or early fall, berries turn dark purple. The berries occur as a drooping bunch that resembles a grape cluster. Berries are poisonous. Do NOT eat the berries.
Birds eat the berries and scatter the seeds. New plants grow from the seeds.

Cluster of pokeweed shoots

Ohio State Weed Lab, The Ohio State University, Bugwood.org

Pokeweed seedlings have alternate leaves. The leaves are red on the underside.

Shoots emerge from established root crowns in the spring. The shoots resemble seedlings, but are thicker and clustered together as shown in the photo.

Pokeweed

Phytolacca americana

Pokeweed may mature into a shrub or small tree, but it is not woody and dies back with the onset of winter. The crushed leaves have a strong, unpleasant odor. All parts of pokeweed are poisonous to people, pets, and livestock. Take action to report and control pokeweed.

Purple loosestrife stems with leaves and flowers

Purple loosestrife has square sided woody stems. It grows up to 10 feet tall. Mature plants may have many dozens of stems. The stems grow from a robust taproot.
Showy, abundant pink to purple flowers grow in spikes throughout summer.

Purple loosestrife leaves in whorls

Mature leaves are lance-shaped and rounded or heart-shaped at the base. Leaves are whorled and arranged opposite each other along the stem.

Purple loosestrife overtaking a wetland

Purple loosestrife spreads quickly by seed. It transforms wet areas and reduces habitat value for wildlife. It has a harmful effect on recreational areas and can clog waterways and irrigation systems.

Purple loosestrife

Lythrum salicaria

Purple loosestrife is an invasive plant. It can quickly dominate wet areas. It reduces habitat quality and clogs waterways.
Purple loosestrife is difficult to control. It spreads with seeds, stems and root fragments. Take action to control this invasive plant and prevent its spread.

Geranio brillante que crece en un denso bosque al costado de la carretera

Weston Miller, Oregon State University

El geranio brillante crece de quince a cuarenta y cinco centímetros de alto. Suele formar montículos densos que sofocan la vegetación. Prefiere los paisajes y los costados de caminos, senderos y bordes de bosques.

Planta de geranio brillante con tallos rojos.

Los tallos varían de verde a rojo, según las condiciones ambientales. Los tallos no tienen pelos.

Puesto de plantas de geranios con hojas rojas.

Weston Miller, Oregon State University

Las plantas se tornan rojas a fines de la primavera y a principios del verano. Las estructuras verdes son flores maduras (cápsulas) que contienen semillas de geranio brillantes.

Cápsulas y semillas de geranio brillante

El geranio brillante expulsa con fuerza sus diminutas semillas de sus cápsulas. Esta característica ayuda a que las semillas se esparzan y formen alfombras densas. Las semillas tienen textura y se adhieren a los zapatos, la ropa y las mascotas. Las semillas se transportan a nuevas zonas.

Mapa de Oregón que muestra la distribución de los geranios brillantes

Distribución del geranio brillante y notificación de especies invasoras en Oregón

Las áreas en rojo muestran los condados de Oregón donde el geranio brillante está muy extendido. Las áreas en amarillo muestran los condados donde tiene una distribución limitada. Las áreas en gris muestran los condados donde no se sabe que haya geranio brillante.

Notificación de especies invasoras

Puede ayudar a las agencias de Oregón a rastrear la distribución de especies invasoras.

Si sabe de una infestación de geranio brillante, infórmelo a la línea directa de especies invasoras de Oregón. Llame al 1-866-INVADER (1-866-468-2337). O utilice su formulario de denuncia en línea.

Hojas brillantes y lobuladas y flores rosadas.

Las hojas son brillantes y lobuladas. El geranio brillante tiene pequeñas flores rosadas con cinco pétalos.

Geranio brillante

Geranium lucidum

El geranio brillante crece de 15 a 45 cm de alto. Tiene hojas brillantes y flores rosadas. El geranio brillante se propaga rápidamente en bosques y jardines sombreados. Tome medidas para controlar esta maleza invasora.

Plantas de tanaceto en flor en el campo

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Los tallos de la hierba cana crecen entre 45 y 120 cm de alto y forman densas matas. La hierba cana crece en zonas con suelos alterados.

Ejemplos de hojas de tanaceto

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Sus hojas son de color verde oscuro por el haz y más claras por el envés. Tienen hojas muy lobuladas y de aspecto ondulado.

Flores de tanaceto

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

La hierba cana tiene flores amarillas, parecidas a las del girasol, con 15 radios que parecen pétalos.

Roseta de tanaceto

Después de que germina una semilla de tanaceto, las plantas forman una roseta. Las rosetas tienen hojas de color verde claro que crecen cerca del suelo. Las hojas son lobuladas.

Larvas de polilla cinabrio en hojas de tanaceto

La polilla cinabrio (Tyria jacobaeae) fue introducida en el noroeste del Pacífico. Ayuda a controlar la hierba cana. Las larvas de la polilla desfolian la hierba cana. Vea a continuación información sobre el control biológico.

Hierba cana tanaceto

Senecio jacobaea

La hierba cana es una planta herbácea (tallos y hojas suaves) con flores amarillas. Los tallos crecen en posición vertical hasta una altura de 0,5 a 4 pies. Es una maleza muy extendida en el noroeste del Pacífico. Es común en áreas afectadas por el pastoreo, la tala, la construcción o los incendios. Tome medidas para controlar la hierba cana.

Tallos, hojas y flores de arcángel amarillo

Las hojas del arcángel amarillo son peludas y dentadas. Crecen unas frente a otras a lo largo del tallo. Sus hojas suelen estar abigarradas con marcas verdes plateadas.

Hojas y flores de arcángel amarillo (verde)

Rob Routledge, Sault College, Bugwood.org

Algunas plantas de arcángel amarillo tienen hojas verdes. Todas las plantas de esta especie tienen flores amarillas como se muestra en la foto.

Ilustración de estratificación del tallo

University of Maine

Una vez que el arcángel amarillo se establece, se propaga a través de acodos de tallos. Cuando los nodos del tallo entran en contacto con el suelo o quedan enterrados, brotan raíces. El dibujo lineal muestra el acodo. Los fragmentos de tallo también pueden echar raíces y establecer nuevas plantas. El arcángel amarillo también se propaga por semillas.

Arcángel amarillo

Lamiastrum galeobdolon

El arcángel amarillo es una planta herbácea (de hojas y tallos suaves) perenne de rápido crecimiento (vive muchos años). Se la ha plantado ampliamente en paisajes del noroeste del Pacífico. Se ha escapado de los paisajes y se está extendiendo rápidamente a las áreas boscosas adyacentes. Tome medidas para controlar esta maleza invasora.

Grupo de hojas de iris de bandera amarilla

John Ruter, University of Georgia, Bugwood.org

Las hojas maduras miden de 60 a 90 centímetros de largo, son aplanadas y tienen forma de espada, típicas de la mayoría de los lirios. Pueden permanecer siempre verdes en inviernos suaves.

Flor de iris de bandera amarilla

Yellow iris (Iris pseudacorus) by Evelyn Simak - geograph.org.uk/p/6172667 is licensed under CC-by-sa/2.0.

Las flores del iris de bandera amarilla tienen 3 sépalos grandes que se extienden hacia abajo y 3 pétalos pequeños erectos. Los sépalos pueden tener venas delicadas de color marrón a púrpura. El color amarillo puede ser brillante o pálido. Florece desde fines de la primavera hasta el verano.

Glossy green seed pod

Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

La vaina de semillas mide hasta 4 pulgadas de largo y es de color verde brillante. Contiene muchas semillas aplanadas de color marrón. Las semillas flotan en el agua y esparcen lirios amarillos por el área circundante.

Rizoma con hojas y raíces.

Joseph M. DiTomaso, University of California - Davis, Bugwood.org

El iris de bandera amarilla se propaga mediante rizomas robustos. Crece rápidamente y forma una densa mata.

Semillas marrones y aplanadas.

Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org

Las semillas aplanadas de color marrón miden aproximadamente ¼ de pulgada de diámetro.

iris de bandera amarilla

Iris pseudacorus

El iris de bandera amarilla es una planta invasora. Se introdujo en el noroeste del Pacífico en jardines acuáticos ornamentales, proyectos de control de la erosión y estanques de tratamiento de aguas residuales. Se propaga rápidamente y forma densas plantaciones en aguas poco profundas y suelos húmedos. El iris de bandera amarilla es tóxico para el ganado. Tome medidas para controlar esta planta invasora y evitar su propagación.

Flor y espinas del cardo estrellado amarillo

"St Barnabys Thistle" by John Tann is licensed under CC BY 2.0.

Las flores son de color amarillo brillante con espinas largas y afiladas en la base.

Tallos de cardo estrellado amarillo de color verde grisáceo

Steve Dewey, Utah State University, Bugwood.org

Los tallos son de color verde grisáceo. Las bases de las hojas alargadas hacen que los tallos parezcan alados.

Roseta de cardo estrellado amarillo

Cindy Roche, Bugwood.org

El cardo estrella amarillo forma una roseta después de germinar. Las plantas en esta etapa desarrollan una gran raíz pivotante.

Plantas de cardo estrellado amarillo que crecen en una densa vegetación

Las plantas de cardo estrella amarillo crecen en densas extensiones de entre 6 pulgadas y 5 pies de altura.

Semillas de cardo estrellado amarillo

Las plantas de cardo estrella amarillo pueden producir miles de semillas. Hasta el 95 % de las semillas son viables y permanecen viables en el suelo durante 3 años o más.

Cardo estrellado amarillo

Centaurea solstitialis

El cardo estrella amarillo desarrolla tallos extendidos de entre 15 y 1,5 metros de altura. Sus tallos son de color verde grisáceo. Forma flores amarillas con espinas afiladas en la base. Las flores espinosas del cardo estrella amarillo dañan y limitan el acceso a ciertas áreas. Tome medidas para controlarlo.

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Especies invasoras y agresivas