Poisonous & Toxic Species
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Green Figwort
Scrophularia umbrosa Dumort.
Scrophularia umbrosa (green figwort) is a perennial sprawling herb native to Europe and western Asia.
Biting Stonecrop
Sedum acre L.
Sedum acre L., or biting stonecrop, is an evergreen mat-forming perennial with yellow flowers, toxic if consumed and irritating to skin.
Lanceleaf Stonecrop
Sedum lanceolatum Torr.
Sedum lanceolatum, or lanceleaf stonecrop, is a small North American succulent and key host for the Rocky Mountain apollo butterfly.
Cambridge Milk-parsley
Selinum carvifolia (L.) L.
Selinum carvifolia (Cambridge milk parsley) is a rare Apiaceae flowering plant native to Eurasia, naturalized in the US.
threadleaf groundsel
Senecio flaccidus Less.
Senecio flaccidus Less. (threadleaf ragwort) is a short-lived perennial shrub native to central/southwestern US and northern/central Mexico.
Madagascar Ragwort
Senecio madagascariensis Poir.
Senecio madagascariensis is a poisonous African daisy-like herb that has been introduced to many warmer regions worldwide.
Mojave Ragwort
Senecio mohavensis A.Gray
Senecio mohavensis is an annual desert herb native to southwestern US and northwestern Mexico that causes minor dermatitis on contact.
cotton burnweed
Senecio quadridentatus Labill.
Cotton fireweed (Senecio quadridentatus Labill.) is an invasive unpalatable poisonous short-lived herb native to New Zealand.
Arrowleaf Senecio
Senecio triangularis Hook.
Senecio triangularis Hook. is a yellow-flowered North American plant that is reportedly poisonous to animals.
Guajillo
Senegalia berlandieri (Benth.) Britton & Rose
Senegalia berlandieri is a toxic North American Fabaceae shrub sometimes illegally used as a replacement for Acacia rigidula in adulterated supplements.
Peanut-Butter Cassia
Senna didymobotrya (Fresen.) H.S.Irwin & Barneby
Senna didymobotrya, or African senna, is a poisonous aromatic shrub used in Kenyan culture for food preparation and skin infection treatment.
Lindheimer's Senna
Senna lindheimeriana (Scheele) H.S.Irwin & Barneby
Senna lindheimeriana, or velvet leaf senna, is a toxic perennial Fabaceae flowering plant native to the southwestern US and eastern Mexico, used in xeriscaping.
American Sicklepod
Senna obtusifolia (L.) H.S.Irwin & Barneby
Senna obtusifolia is a widespread weedy plant used in traditional medicine, food production, and commercial food additives.
Coffee Senna
Senna occidentalis (L.) Link
Senna occidentalis is a foul-smelling toxic pantropical shrub that has traditional dietary and medicinal uses in South Asia.
Two-leaved Senna
Senna roemeriana (Scheele) H.S.Irwin & Barneby
Twoleaf senna (Senna roemeriana) is a toxic perennial flowering fabaceous plant native to the south-central US and northern Mexico.
Rattlebush
Sesbania drummondii (Rydb.) Cory
Sesbania drummondii is a poisonous medium-sized perennial legume shrub native to the southeastern US.
Scarlet Sesbane
Sesbania punicea (Cav.) Benth.
Sesbania punicea is a toxic, spreading shrub native to South America that grows in moist, disturbed areas.
Canadian buffalo-berry
Shepherdia canadensis (L.) Nutt.
Shepherdia canadensis is a dioecious nitrogen-fixing deciduous shrub known as soapberry, native to northern North America.
Oconee bells
Shortia galacifolia Torr. & A.Gray
Shortia galacifolia is an endemic relict shade-loving flowering plant native to a small North American range, that can be cultivated further north.
Moss Campion
Silene acaulis (L.) Jacq.
Silene acaulis, or moss campion, is a low cushion alpine/arctic plant with complex flower gender and warming-related climate risk.
fire pink
Silene virginica L.
Silene virginica (fire pink) is a red-flowered North American perennial that is mainly pollinated by ruby-throated hummingbirds.
prairie dock
Silphium terebinthinaceum Jacq.
Silphium terebinthinaceum (prairie dock) is a North American prairie-adapted perennial herb with historic medicinal uses and potential toxicity.
milk thistle
Silybum marianum (L.) Gaertn.
Silybum marianum, or milk thistle, is an herb cultivated for food and traditional medicine, that is invasive in many introduced regions.
jojoba
Simmondsia chinensis (Link) C.K.Schneid.
Simmondsia chinensis (jojoba) is a North American desert shrub grown commercially for its oil, used in skincare and other products.
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