Many different plant mintage found in Oregon are toxic to human and beast , but only a few are most usually encountered throughout the commonwealth . Some of the poisonous plants in Oregon are toxic if eaten , while others are poisonous when tinge , having " dermal toxicity . " Some of the flora are also more deadly than others .
Nightshades
Nightshades ( Solanum spp . ) , or belladonna , are toxic plant that are usually regain in Oregon , although they are n’t natives . nightshade are most often found maturate in shady areas , such as woodlands , and have a distinct foul odor . They blossom during later summer with purplish and chicken flowers , develop bright - ruby , Chuck Berry - like oblong fruits . The vine , roots , leave and yield are all highly toxicant if eaten , causing increase heartbeat rate and even paralysis . touch the nightshade plant can also leave toxic residues on the skin .
Oleander
Oleander ( Nerium rose bay ) is a small tree diagram or shrub that can reach up to 30 feet in stature . The Nerium oleander has dark - unripened , alternately arranged farewell and blooms in white , yellow , pinkish or crimson flower . oleander produce brown , pod - comparable fruits that hold back numerous tiny seed . All parts of the oleander are poisonous if consume , but especially the farewell , stem and branch . Burning the Mrs. Henry Wood can also release toxic exhaust fumes .
Castor Bean
The castor bonce ( Ricinus communis ) is often found grow in the more temperate neighborhood of Oregon . Castor bean industrial plant have heavy , star - shaped leaves that grow in an alternating way along the theme . The bean - alike yield emerge in clustering at the topmost part of the plant with large seeds . All parts of the castor bean plant works are toxicant if have , but the seeds are specially toxic . Consuming as few as two caster bean cum can be black .
Water Hemlock
The weewee hemlock ( Cicuta maculata ) is a perennial herb that grows up to 6 human foot marvellous with hollow , bamboo - like stems that are sometimes royal or red divest . The water hemlock is extremely toxic if ingested , specially the root and seeds . The roots ooze a poisonous , yellow oil when cut . Poison hemlock ( Conium maculatum ) is also highly toxic if assimilate , even in small amounts . poisonous substance hemlock tree are biyearly herbaceous plant with smooth , hollow stems that are often violet and clean or mottle with loss . The poison hemlock tree can spring up up to 8 feet grandiloquent and , like the water hemlock , blooms in small , flat - top clusters of tiny ashen flowers . Poison and H2O winter fern are ordinarily discover growing in tight or moist areas , such as on stream banks , in ditches and along swampland or wetland .
Poison Oak/Ivy
Poison oak tree ( Toxicodendron diversibba ) has compound leaf comprised of three leaflets and arranged alternately along the stems . The leaves are lob and oak - like . Poison oak tree grows in a bush - like form and produce waxy berries that turn from immature to whitened or yellow to gray . Poison ivy ( T. radicans ) is similar to poison oak , but its leafage are unruffled , non - lobed and serrate along the edge . Poison English ivy grow in a vine material body along the ground or up tree and structures . Both poisonous substance oak and ivy are toxic , cause sometimes severe dermatitis after middleman with break tegument . Burning the plants can also release the toxic plant life oil color and conduct them in the idle words , irritate the center , cutis and pharynx .
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