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.
Cowbane
Cicuta virosa L.
Cicuta virosa L., or water hemlock, is a highly toxic perennial herb that grows in wet, marshy habitats.
sorrelvine
Cissus trifoliata (L.) L.
Cissus trifoliata is a poisonous New World woody vine in the grape family native to parts of the Americas and the Caribbean.
miner's lettuce
Claytonia perfoliata Donn.
Claytonia perfoliata, commonly miner's lettuce, is an edible rosette plant native to western North America and naturalized elsewhere.
Western White Clematis
Clematis ligusticifolia Nutt. ex Torr. & A.Gray
Clematis ligusticifolia is a North American climbing vine with toxic irritant compounds and a history of medicinal and culinary use.
Lily of the Valley Tree
Clethra arborea Aiton
Clethra arborea Aiton is a toxic evergreen shrub or small tree with fragrant white summer flowers.
bluebead lily
Clintonia borealis (Aiton) Raf.
Clintonia borealis is a slow-spreading shade-loving perennial of eastern North American forests with semi-poisonous blue berries.
autograph tree
Clusia rosea Jacq.
Clusia rosea, the autograph tree, is a Caribbean-native hemiepiphytic tree grown ornamentally, with historical uses.
Tree Spinach
Cnidoscolus aconitifolius (Mill.) I.M.Johnst.
Cnidoscolus aconitifolius, commonly chaya, is a toxic-raw nutritious cultivated leafy green native to the Americas.
Autumn Crocus
Colchicum autumnale L.
Colchicum autumnale is a toxic herbaceous perennial native to Europe, source of the drug colchicine used in medicine and plant breeding.
citronella horse balm
Collinsonia canadensis L.
Collinsonia canadensis, richweed or stoneroot, is a perennial mint-family herb native to eastern North America, with traditional herbal uses.
bastard toadflax
Comandra umbellata (L.) Nutt.
Comandra umbellata is a hemiparasitic perennial herb with three subspecies, human uses, and potential fruit selenium toxicity.
river bushwillow
Combretum erythrophyllum (Burch.) Sond.
Combretum erythrophyllum is a hardy southern African tree with defined ecology and noted toxic medicinal uses.
Rangoon Creeper
Combretum indicum (L.) De Filipps
Combretum indicum, or Rangoon creeper, is a climbing woody vine with toxic seeds that have been used to treat worm infections.
European lily of the valley
Convallaria majalis L.
Convallaria majalis (lily of the valley) is a poisonous herbaceous perennial native to Europe with traditional folk medicine uses.
field bindweed
Convolvulus arvensis L.
Convolvulus arvensis (field bindweed) is a perennial climbing vine, with detailed traits, ecology, and traditional uses described.
Māmāngi
Coprosma arborea Kirk
Coprosma arborea, Māori name mamangi, is a New Zealand tree species found in the North Island's Hamilton Ecological District.
Spleenwortleaf Goldthread
Coptis aspleniifolia Salisb.
Coptis aspleniifolia (fernleaf goldthread) is a common evergreen perennial native to Pacific Northwest North American temperate rainforests.
Anacahuita
Cordia boissieri A.DC.
Cordia boissieri is a small evergreen tree with edible processed fruits and multiple medicinal and practical uses.
Tree Tutu
Coriaria arborea Linds.
Coriaria arborea (tutu) is a toxic New Zealand endemic shrub that Māori have used for processed edible juice.
ink plant
Coriaria myrtifolia L.
Coriaria myrtifolia, or redoul, is a Mediterranean toxic shrub traditionally used for tanning and dyeing.
Coriaria ruscifolia L.
Coriaria ruscifolia L.
Coriaria ruscifolia is a poisonous deciduous shrub with toxic and traditional psychoactive and medicinal uses across the Americas.
Coriaria sarmentosa G.Forst.
Coriaria sarmentosa G.Forst.
Coriaria sarmentosa G.Forst. is a poisonous endemic New Zealand large shrub, commonly known as tutu.
flowering dogwood
Cornus florida L.
Cornus florida L. (flowering dogwood) is a small deciduous flowering tree widely cultivated for ornamental use, with traditional medicinal uses.
kousa dogwood
Cornus kousa Bürger ex Hance
Cornus kousa is an ornamental dogwood tree with showy spring blooms, edible fruit, and resistance to dogwood anthracnose.
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