Poisonous & Toxic Species
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Arisaema serratum (Thunb.) Schott
Arisaema serratum (Thunb.) Schott
Arisaema serratum is a toxic perennial flowering arum native to Japan’s northern and central regions.
Calico-flower
Aristolochia littoralis Parodi
Aristolochia littoralis, commonly Dutchman's pipe, is a toxic climbing vine native to South America and invasive elsewhere.
Italian arum
Arum italicum Mill.
Arum italicum Mill. is a poisonous ornamental aroid with variable subspecies native across Europe, North Africa, and West Asia.
showy milkweed
Asclepias speciosa Torr.
Asclepias speciosa is a North American perennial milkweed, a key host plant for monarch butterflies, with some traditional human uses.
Deadly Nightshade
Atropa belladonna L.
Atropa belladonna (deadly nightshade) is a highly toxic perennial plant with a long history of medicinal and poisonous use.
mule fat
Baccharis salicifolia (Ruiz & Pav.) Pers.
Baccharis salicifolia, mule fat, is a sticky flowering shrub native to the southwestern US, northern Mexico, and parts of South America.
common bamboo
Bambusa vulgaris Schrad. ex J.C.Wendl.
Bambusa vulgaris is a widely cultivated tropical thornless bamboo with many uses and toxic compounds in its shoots.
thick-pod white wild indigo
Baptisia alba (L.) R.Br.
Baptisia alba, commonly white wild indigo, is a North American native legume that hosts specific insect larvae and is toxic to livestock and humans.
Fish Poison Tree
Barringtonia asiatica (L.) Kurz
Barringtonia asiatica is a toxic coastal tropical tree with showy fragrant flowers, buoyant ocean-dispersed fruit, and traditional human uses.
hoary alyssum
Berteroa incana (L.) DC.
Berteroa incana is a hairy herbaceous flowering plant toxic to horses, sometimes used ornamentally for ground cover in Europe.
Fragrant Candelabra
Brunsvigia bosmaniae F.M.Leight.
Brunsvigia bosmaniae is a South African Amaryllidaceae tumbleweed geophyte known for profuse pink fragrant night flowers, that may be toxic.
California incense-cedar
Calocedrus decurrens (Torr.) Florin
Calocedrus decurrens (incense cedar) is a large long-lived conifer native to western North America, used for wood and cultivated ornamentally.
crown flower
Calotropis gigantea (L.) W.T.Aiton
Calotropis gigantea is a poisonous milk-bearing plant used for rituals, fiber, folk medicine, and studied for anti-cancer properties.
great camas
Camassia leichtlinii (Baker) S.Watson
Camassia leichtlinii, or great camas, is an edible bulb perennial with specific moisture and fire ecology needs.
Papaya
Carica papaya L.
Carica papaya L. (papaya) is a widely cultivated pantropical tropical fruit with specific cultivation, use, and toxicity traits.
Madagascar Periwinkle
Catharanthus roseus (L.) G.Don
Catharanthus roseus is a toxic flowering plant that produces the cancer-fighting alkaloids vinblastine and vincristine.
Grey Milkwood
Cerbera manghas L.
Cerbera manghas L. is a toxic plant with historical ordeal use and potential chemotherapeutic properties.
Pine Thistle
Chamaeleon gummifer (L.) Cass.
Chamaeleon gummifer is a toxic Mediterranean perennial thistle that is a common source of fatal poisoning in Morocco.
Turkish Towel
Chondracanthus exasperatus
Chondracanthus exasperatus is a perennial Pacific North American red algae with variable morphology, ecological roles, and human uses.
bulblet-bearing water hemlock
Cicuta bulbifera L.
Cicuta bulbifera L. is a poisonous North American perennial wetland plant that reproduces by seeds and bulbils.
Western Water Hemlock
Cicuta douglasii (DC.) J.M.Coult. & Rose
Cicuta douglasii, western water hemlock, is North America's most poisonous toxic plant, native from Alaska to California, growing in wet habitats.
water hemlock
Cicuta maculata L.
Cicuta maculata, North America's most toxic native plant, is a poisonous perennial herb that grows in wet habitats.
Variegated Croton
Codiaeum variegatum (L.) Rumph. ex A.Juss.
Codiaeum variegatum, or variegated croton, is a colorful toxic tropical shrub widely cultivated as an ornamental plant.
poison hemlock
Conium maculatum L.
Conium maculatum (poison hemlock) is a highly toxic nitrophilic herb with a well-documented history of poisonings and historical medicinal uses.
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