Poisonous & Toxic Species
Never touch, taste, or consume any species you cannot positively identify. This guide is for educational purposes only. When in doubt, consult a local expert. Use the iNature app for quick AI-powered identification in the field.
Polynesian Arrowroot
Tacca leontopetaloides (L.) Kuntze
Tacca leontopetaloides (Polynesian arrowroot) is an ancient Austronesian root crop cultivated for starch, with traditional food and medicinal uses.
wild marigold
Tagetes minuta L.
Tagetes minuta L. is an edible marigold species with diverse non-food uses and potential skin-irritating oils.
Tara
Tara spinosa (Molina) Britton & Rose
Tara spinosa is a small tree with specific morphology that yields food additives tara gum and potentially toxic tara flour.
common yew
Taxus baccata L.
Taxus baccata L. is a poisonous evergreen tree native to Europe and nearby regions, with uses in horticulture and chemotherapy.
Marsh Fleawort
Tephroseris palustris (L.) Fourr.
Tephroseris palustris (marsh ragwort) is a variable hairy annual/biennial plant of cold wet areas, often linked to overgrazing arctic habitats.
Purple Hoarypea
Tephrosia purpurea (L.) Pers.
Tephrosia purpurea is an unpalatable toxic leguminous desert forb found across Africa, Asia, used as fish poison.
goat's rue
Tephrosia virginiana (L.) Pers.
Tephrosia virginiana is a toxic North American subshrub with bi-colored pea flowers and historical uses including as a hair wash and fish poison.
Spineless Horsebrush
Tetradymia canescens DC.
Tetradymia canescens DC. is a North American wildfire-resistant toxic shrub with medicinal cultural uses.
littleleaf horsebrush
Tetradymia glabrata Torr. & A.Gray
Tetradymia glabrata, or littleleaf horsebrush, is a toxic western US shrub in the aster family.
Felty Germander
Teucrium polium L.
Teucrium polium, or felty germander, is a western Mediterranean sub-shrub with edible and medicinal leaves that carries liver toxicity risk.
villous deadly carrot
Thapsia villosa L.
Thapsia villosa L. is a highly variable poisonous perennial Apiaceae herb native to southwestern Europe and northwestern Africa.
Mountain goldenbean
Thermopsis montana Nutt.
Thermopsis montana Nutt. is a perennial herb used as an ornamental and medicinal plant that is suspected of being poisonous.
Golden bean
Thermopsis rhombifolia (Pursh) Richardson
Thermopsis rhombifolia, or prairie thermopsis, is a toxic North American legume perennial herb with yellow flowers.
Mitnan
Thymelaea hirsuta (L.) Endl.
Thymelaea hirsuta is a toxic circum-Mediterranean xerophytic shrub with documented traditional and modern medicinal uses.
climbing dogbane
Thyrsanthella difformis (Walter) Pichon
Thyrsanthella difformis is a toxic deciduous twining vine in the dogbane family, native to North America, that oozes milky sap when damaged.
Silver Lime
Tilia tomentosa Moench
Tilia tomentosa is a deciduous ornamental tree with cultivated varieties, known for fragrant flowers and debated effects on foraging bees.
Scottish Asphodel
Tofieldia pusilla (Michx.) Pers.
Tofieldia pusilla, or Scottish asphodel, is a circumpolar flowering plant used in Scottish folk medicine to treat multiple ailments.
upright hedge-parsley
Torilis japonica (Houtt.) DC.
Torilis japonica, Japanese hedge parsley, is a flowering plant with medicinal properties including potential anti-cancer effects.
Pacific poison oak
Toxicodendron diversilobum (Torr. & A.Gray) Greene
Western poison oak, Toxicodendron diversilobum, is a variable North American plant that causes allergic contact dermatitis in most humans.
Atlantic poison oak
Toxicodendron pubescens Mill.
Toxicodendron pubescens (Atlantic poison oak) is a poisonous shrub native to the Southeastern US, whose urushiol causes severe skin irritation in sensitive people.
western poison ivy
Toxicodendron rydbergii (Small ex Rydb.) Greene
Toxicodendron rydbergii is a urushiol-containing toxic North American shrub related to eastern poison ivy that causes contact dermatitis.
Japanese wax tree
Toxicodendron succedaneum (L.) Kuntze
Toxicodendron succedaneum is an Asian flowering wax tree with ornamental, industrial, and medicinal uses, classified as a noxious weed in Australia and New Zealand.
Nuttall's Deathcamas
Toxicoscordion nuttallii (A.Gray) Rydb.
Toxicoscordion nuttallii is a poisonous bulb-forming herb native to the south-central United States.
foothill deathcamas
Toxicoscordion paniculatum (Nutt.) Rydb.
Toxicoscordion paniculatum (foothill death camas) is a poisonous North American flowering bulb occasionally grown in cultivation.
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