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.
conkerberry
Carissa ovata R.Br.
Carissa spinarum (conkerberry) is an Apocynaceae shrub with edible ripe fruit, wide distribution, and both weedy and restorative uses.
Bush Plum
Carissa spinarum L.
Carissa spinarum (conkerberry) is an Apocynaceae shrub widespread across Old World tropics, with edible ripe fruit and diverse ecological roles.
Burmese Fishtail-palm
Caryota mitis Lour.
Caryota mitis is a clustered palm with harmful irritant fruits, cultivated ornamentally and used in traditional Cambodian medicine and food.
Be-still tree
Cascabela thevetia (L.) Lippold
Cascabela thevetia is a toxic evergreen tropical shrub or small tree grown ornamentally, with cardiac glycoside toxins.
Blackbean
Castanospermum australe A.Cunn. ex Mudie
Castanospermum australe, or black bean, is a large evergreen tree native to Australasia with edible prepared seeds and ornamental uses.
blue cohosh
Caulophyllum thalictroides (L.) Michx.
Caulophyllum thalictroides is a North American forest herb with blue berries, used historically for medicine and as a coffee substitute.
Oriental bittersweet
Celastrus orbiculatus Thunb.
Celastrus orbiculatus is a deciduous poisonous vine, naturalized in eastern North America, grown as an ornamental with uses for weaving and cordage.
American bittersweet
Celastrus scandens L.
Celastrus scandens L. is a poisonous perennial vine with historical medicinal uses that is also grown decoratively.
Yellow Star-Thistle
Centaurea solstitialis L.
Centaurea solstitialis (yellow star-thistle) is a weedy annual herb that is invasive outside its native Eurasian range.
spotted knapweed
Centaurea stoebe L.
Centaurea stoebe L., or spotted knapweed, is a Eurasian invasive plant in North America with unproven tumor-causing claims.
buttonbush
Cephalanthus occidentalis L.
Cephalanthus occidentalis, or buttonbush, is a North American deciduous shrub/small tree of wetlands, used ornamentally and historically medicinally.
Curveseed Butterwort
Ceratocephala orthoceras DC.
Ceratocephala orthoceras DC., also called bur buttercup, is a small poisonous invasive flowering plant native to Eurasia.
coontail
Ceratophyllum demersum L.
Ceratophyllum demersum, also called rigid hornwort, is a widespread submerged aquatic plant used in aquaria and research.
orange cestrum
Cestrum aurantiacum Lindl.
Cestrum aurantiacum is an ornamental shrub, native to Central America, toxic to animals and invasive in some regions.
purple cestrum
Cestrum elegans (Brongn. ex Neumann) Schltdl.
Cestrum elegans is a poisonous evergreen ornamental shrub with sweet-scented purplish-red flowers, pollinated by hummingbirds.
night jessamine
Cestrum nocturnum L.
Cestrum nocturnum L. is an evergreen fragrant ornamental shrub with recorded potential toxicity to humans and animals.
green cestrum
Cestrum parqui (Lam.) L'Hér.
Cestrum parqui is a woody semi-evergreen shrub with toxic alkaloids that has multiple folk medicine uses.
tomentose cestrum
Cestrum tomentosum L.fil.
Cestrum tomentosum is a poisonous Cestrum species native to Central and South America with fragrant pink flowers and pink berries.
Rough chervil
Chaerophyllum temulum L.
Chaerophyllum temulum L. is a toxic, biennial herb with widespread Eurasian distribution, sometimes used in folk medicine.
Christmas Berry
Chironia baccifera L.
Chironia baccifera is a bushy ornamental shrub native to southern South Africa that is mildly toxic.
wavy-leafed soap plant
Chlorogalum pomeridianum (DC.) Kunth
Chlorogalum pomeridianum is a perennial bulbous soap plant with a range of documented historical uses by people.
Soft Fern
Christella dentata (Forssk.) Brownsey & Jermy
Christella dentata is a small edible fern widespread across Australia, the south Pacific, and naturalized in Hawaii, with folk medicinal use and anti-leukemia cell activity in lab tests.
Turn-sole
Chrozophora tinctoria (L.) A.Juss.
Chrozophora tinctoria is a poisonous annual plant historically used to make the blue-purple dye turnsole.
clustered everlasting
Chrysocephalum semipapposum (Labill.) Steetz
Chrysocephalum semipapposum, also known as clustered everlasting, is an Australian native perennial shrub widely used in gardening and floristry.
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