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.
Hollowroot
Corydalis cava (L.) Schweigg. & Körte
Corydalis cava is a spring ephemeral plant containing alkaloids including the occasionally medicinally used bulbocapnine.
Yellow Corydalis
Corydalis flavula (Raf.) DC.
Corydalis flavula is an herbaceous perennial native to eastern US, with documented historical medicinal uses by multiple cultures.
pig's ear
Cotyledon orbiculata L.
Cotyledon orbiculata is a variable South African succulent with medicinal uses and known toxicity to livestock and dogs.
redflower ragleaf
Crassocephalum crepidioides (Benth.) S.Moore
Crassocephalum crepidioides is an edible annual herb, used as vegetable and medicine, contains toxic alkaloid and is invasive in New Caledonia.
jade plant
Crassula ovata (Mill.) Druce
Crassula ovata, the jade plant, is a succulent evergreen shrub grown commonly as an ornamental.
Tree Crinum
Crinum asiaticum L.
Crinum asiaticum is a toxic perennial Asian herb with traditional indigenous uses in Taiwan.
shakeshake
Crotalaria incana L.
Crotalaria incana is a toxic flowering Fabaceae species that grows in seasonally dry tropical disturbed areas and has traditional uses.
Rattleweed
Crotalaria retusa L.
Crotalaria retusa L. is an annual Australian native herb grown for fibre, green manure and forage, though it is poisonous to livestock.
Showy Rattlebox
Crotalaria spectabilis Roth
Crotalaria spectabilis is a toxic perennial herb in the pea family, native to Asia and an invasive agricultural pest worldwide.
turkey mullein
Croton setiger Hook.
Croton setiger is a low-growing native North American plant used ornamentally, traditionally as a fish toxin and medicine, and its seeds attract birds.
paddy melon
Cucumis myriocarpus Naudin
Cucumis myriocarpus is a toxic invasive annual herb from southern Africa, a noxious weed in Australia and California.
Monterey Cypress
Cupressus macrocarpa Hartw. ex Gordon
This is an overview of Hesperocyparis macrocarpa, Monterey cypress, covering its description, distribution, cultivation and uses.
Persian Cyclamen
Cyclamen persicum Mill.
Cyclamen persicum is a semi-poisonous perennial herb cultivated widely as an ornamental, native from North Africa to West Asia.
Quince
Cydonia oblonga Mill.
Cydonia oblonga, or quince, is a fruiting tree/shrub cultivated globally for its culinary uses.
Monkeyrope Buckhorn
Cynanchum ellipticum (Harv.) R.A.Dyer
Cynanchum ellipticum is a toxic South African climbing Apocynaceae plant that causes livestock poisoning.
honey-vine climbing milkweed
Cynanchum laeve (Michx.) Pers.
Cynanchum laeve is a twining vine in the Apocynaceae family that is toxic to humans and livestock, and hosts monarch caterpillars.
Caustic Vine
Cynanchum viminale (L.) L.
Cynanchum viminale is a leafless succulent used as forage, food, and traditional medicine across a broad environmental range.
Bermuda grass
Cynodon dactylon (L.) Pers.
Cynodon dactylon is a widespread warm-climate cultivated grass with defined morphological, growth, and reported medicinal traits.
Chinese forget-me-not
Cynoglossum amabile Stapf & J.R.Drumm.
Cynoglossum amabile, Chinese forget-me-not, is an ornamental annual flowering plant native to Asia that contains toxic alkaloids.
hound's-tongue
Cynoglossum officinale L.
Cynoglossum officinale L. (houndstongue) is a toxic, sometimes weedy flowering plant found in Europe and introduced North America.
Scotch Broom
Cytisus scoparius (L.) Link
Cytisus scoparius, common broom, is a European leguminous shrub with invasive potential, ornamental cultivars, and traditional medicinal uses.
Rose Daphne
Daphne cneorum L.
Daphne cneorum is a toxic evergreen flowering shrub native to Europe, popularly cultivated in alpine and rock gardens.
Flax-leaved Daphne
Daphne gnidium L.
Daphne gnidium L. is a poisonous evergreen shrub native to the Mediterranean area that has fragrant white flowers and red drupes.
Spurge-laurel
Daphne laureola L.
Daphne laureola L. is an evergreen poisonous shrub native to Great Britain that grows on alkaline soils.
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