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.
Acacia penninervis Sieber ex DC.
Acacia penninervis Sieber ex DC.
Acacia penninervis Sieber ex DC. is an Australian acacia grown for environmental management, formerly used by Aboriginal people for fishing.
prairie acacia
Acaciella angustissima (Mill.) Britton & Rose
Acaciella angustissima is a thornless fabaceous shrub/small tree native to the Americas, with traditional medicinal uses and cultivation for erosion control.
Indian Acalypha
Acalypha indica L.
Acalypha indica L. is an annual herb with a wide native range in Old World tropics, used in multiple traditional medicine systems and as food.
box elder
Acer negundo L.
Acer negundo L. (box elder) is a dioecious maple native to North America, invasive in many regions with known uses and toxicity.
common yarrow
Achillea millefolium L.
Achillea millefolium, common yarrow, is a widespread herbaceous perennial with cultivation, traditional, and ecological uses.
Columbian Monkshood
Aconitum columbianum Nutt.
Aconitum columbianum Nutt. is a poisonous herbaceous perennial monkshood native to western North America, sometimes grown as a garden plant.
Northern Wolfsbane
Aconitum lycoctonum L.
Aconitum lycoctonum (northern wolf's-bane) is a poisonous, ornamental herbaceous perennial flowering plant native to Europe and northern Asia.
Northern Wolfsbane
Aconitum septentrionale Koelle
Aconitum septentrionale Koelle (Aconitum lycoctonum, wolf's-bane) is a poisonous herbaceous perennial flowering plant native to Europe and northern Asia, grown ornamentally.
Aconitum tauricum Wulfen
Aconitum tauricum Wulfen
Aconitum tauricum is a poisonous perennial European alpine wildflower that blooms from August to October.
Eurasian Sweet-Flag
Acorus calamus L.
Acorus calamus L. (sweet flag) is a wetland perennial with noted toxicity, and a long history of traditional and commercial uses.
Macaw palm
Acrocomia aculeata (Jacq.) Lodd. ex R.Keith
Acrocomia aculeata, the macauba palm, is a spiny Neotropical palm cultivated for biodiesel and food uses.
Tall Bugbane
Actaea elata (Nutt.) Prantl
Actaea elata is a poisonous rhizomatous herbaceous perennial native to Pacific Northwest old-growth forests, listed as endangered in British Columbia.
Eurasian baneberry
Actaea spicata L.
Actaea spicata L. is an herbaceous perennial ornamental plant that is toxic, irritant, and used in homeopathy for joint pain.
Saga Tree
Adenanthera pavonina L.
Adenanthera pavonina L., red sandalwood, is a medium tropical tree with bright red seeds, used for multiple purposes including ornament, medicine and timber.
Summer Pheasant's-eye
Adonis aestivalis L.
Adonis aestivalis L. is an annual herb that has been widely used for a variety of medicinal purposes, including cardiac treatments.
Spring Adonis
Adonis vernalis L.
Adonis vernalis is a poisonous perennial flowering plant in the buttercup family with medicinal and ornamental uses native to Eurasia.
Budda Pea
Aeschynomene indica L.
Aeschynomene indica L. is a variable weedy legume with multiple uses, though its seeds are toxic to pigs.
California buckeye
Aesculus californica (Spach) Nutt.
Aesculus californica, the California buckeye, is a western North American native tree or shrub with toxic seeds, grown ornamentally and used historically by Native groups.
yellow buckeye
Aesculus flava Sol.
Aesculus flava, yellow or sweet buckeye, is a large deciduous North American tree grown ornamentally for its showy flowers and fall color.
Ohio buckeye
Aesculus glabra Willd.
Aesculus glabra Willd., or Ohio buckeye, is a poisonous North American tree with potential anti-cancer extract properties.
Red Buckeye
Aesculus pavia L.
Aesculus pavia, or red buckeye, is a large shrub or small tree with dark red spring flowers and poisonous seeds.
painted buckeye
Aesculus sylvatica W.Bartram
Aesculus sylvatica, the painted buckeye, is a poisonous shrub found in forests and along stream banks.
lechuguilla
Agave lechuguilla Torr.
Agave lechuguilla, or shin-daggers, is a Chihuahuan Desert agave with toxic foliage and various human uses.
Crofton Weed
Ageratina adenophora (Spreng.) R.M.King & H.Rob.
Ageratina adenophora, or crofton weed, is a toxic invasive perennial shrub native to Mexico that is a noxious weed worldwide.
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