| poisonous plant | | |
| n. (plant) | 1. poisonous plant | a plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism. |
| ~ plant life, flora, plant | (botany) a living organism lacking the power of locomotion. |
| ~ aconite | any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers. |
| ~ cohosh, herb christopher, baneberry | a plant of the genus Actaea having acrid poisonous berries. |
| ~ hellebore | any plant of the Eurasian genus Helleborus. |
| ~ dogbane | any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root. |
| ~ nerium oleander, oleander, rose bay | an ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters of fragrant white to pink or red flowers: native to East Indies but widely cultivated in warm regions. |
| ~ climbing lily, creeping lily, gloriosa, gloriosa superba, glory lily | any plant of the genus Gloriosa of tropical Africa and Asia; a perennial herb climbing by means of tendrils at leaf tips having showy yellow to red or purple flowers; all parts are poisonous. |
| ~ common snowberry, snowberry, symphoricarpos alba, waxberry | deciduous shrub of western North America having spikes of pink flowers followed by round white berries. |
| ~ american holly, christmas holly | an evergreen tree. |
| ~ poison ash, poison dogwood, rhus vernix, toxicodendron vernix, poison sumac | smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries; yields an irritating oil. |
| ~ markweed, poison mercury, rhus radicans, toxicodendron radicans, poison ivy, poison oak | climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact. |
| ~ rhus diversiloba, toxicodendron diversilobum, western poison oak | poisonous shrub of the Pacific coast of North America that causes a rash on contact. |
| ~ eastern poison oak, rhus quercifolia, rhus toxicodenedron, toxicodendron quercifolium | poisonous shrub of southeastern United States causing a rash on contact. |
| ~ chinese lacquer tree, japanese lacquer tree, japanese sumac, japanese varnish tree, lacquer tree, rhus verniciflua, toxicodendron vernicifluum, varnish tree | small Asiatic tree yielding a toxic exudate from which lacquer is obtained. |
| ~ lantana | a flowering shrub. |
| ~ aethusa cynapium, fool's parsley, lesser hemlock | European weed naturalized in America that resembles parsley but causes nausea and poisoning when eaten. |
| ~ cicuta verosa, water hemlock | tall erect highly poisonous Eurasiatic perennial herb locally abundant in marshy areas. |
| ~ spotted cowbane, spotted hemlock, spotted water hemlock | tall biennial water hemlock of northeastern North America having purple-spotted stems and clusters of extremely poisonous tuberous roots resembling small sweet potatoes. |
| ~ california fern, conium maculatum, nebraska fern, poison hemlock, poison parsley, winter fern, hemlock | large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous. |
| ~ hemlock water dropwort, oenanthe crocata, water dropwort | European poisonous herb having tuberous roots, yellow juice that stains the skin, yellow flowers and foliage resembling celery; all parts extremely poisonous. |
| ~ oenanthe aquatica, water fennel | European poisonous herb with fibrous roots. |
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