Poisonous & Toxic Species
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Iris humilis Georgi
Iris humilis Georgi
Iris humilis Georgi is a small, yellow-flowered iris species native to temperate Eurasia with traditional medicinal uses.
Fringed Iris
Iris japonica Thunb.
Iris japonica Thunb. is a flowering crested iris with a range across Asia, known for cultivation, recorded toxicity, and multiple human uses.
Dwarf Lake Iris
Iris lacustris Nutt.
Iris lacustris Nutt. is a small Great Lakes-region iris relative with blue to purple flowers and distinct elaiosome-bearing seeds.
Central Coast iris
Iris longipetala Herb.
Iris longipetala is a California-native iris species with toxic parts, cultivated in gardens.
Lortet iris
Iris lortetii Barbey
Iris lortetii is an endemic, potentially toxic showy iris from the Eastern Mediterranean, known as difficult to cultivate.
western blue flag
Iris missouriensis Nutt.
Iris missouriensis is a toxic rhizomatous perennial iris with various recorded Native American uses.
Yellow Iris
Iris pseudacorus L.
Iris pseudacorus L. is a yellow-flowered wetland perennial with multiple ornamental cultivars and various ecological and practical uses.
Japanese Iris
Iris sanguinea Hornem.
Iris sanguinea is an eastern Asian iris species that is toxic to humans and cultivated as an easy-to-grow garden plant.
Prairie Iris
Iris savannarum Small
Iris savannarum is a poisonous rhizomatous iris native to the southeastern US that differs from Iris hexagona in multiple traits.
Beach-head Iris
Iris setosa Pall. ex Link
Iris setosa is a circumpolar iris species native to Asia and North America, with a long history of herbal and cultural uses.
Siberian Iris
Iris sibirica L.
Iris sibirica L. is a branched-stemmed blue iris native to Eurasia, naturalized in North America, with cultivation details and recorded traditional uses.
Blue Iris
Iris spuria L.
Iris spuria L. is a wide-ranging iris species with scented blue-purple flowers, toxic parts, and uses as a garden cut flower.
burroweed
Isocoma tenuisecta Greene
Isocoma tenuisecta, also called burroweed, is a toxic North American perennial herb native to the southwestern US and Sonora.
Bellyache Bush
Jatropha gossypiifolia L.
Jatropha gossypiifolia is a poisonous tropical flowering shrub that has traditional medicinal and other uses.
Coralbush
Jatropha multifida L.
Jatropha multifida is a mildly toxic garden Jatropha species native to Mexico and the Caribbean, introduced to many warmer regions worldwide.
Gout Stalk
Jatropha podagrica Hook.
Jatropha podagrica is a toxic caudiciform herb grown ornamentally, with researched traditional medicinal and industrial uses.
twinleaf
Jeffersonia diphylla (L.) Pers.
Jeffersonia diphylla, twinleaf, is a small spring ephemeral native to eastern North American deciduous forests that is considered poisonous.
savin juniper
Juniperus sabina L.
Juniperus sabina L. is a variable poisonous dioecious shrub, grown ornamentally, with traditional medicinal uses.
Air Plant
Kalanchoe pinnata (Lam.) Pers.
Kalanchoe pinnata is a succulent native to Madagascar, widely naturalized as an invasive, with documented traditional uses and known cardiac toxicity.
sheep laurel
Kalmia angustifolia L.
Kalmia angustifolia L., or sheep laurel, is a toxic evergreen shrub native to eastern North America, grown ornamentally.
mountain laurel
Kalmia latifolia L.
Kalmia latifolia, or mountain laurel, is a toxic evergreen North American shrub grown ornamentally for its attractive clustered flowers.
Western Bog Laurel
Kalmia microphylla (Hook.) A.Heller
Kalmia microphylla is a poisonous evergreen shrub found in northwestern North America that has medicinal uses.
Coyotillo
Karwinskia humboldtiana (Roem. & Schult.) Zucc.
Karwinskia humboldtiana, common names coyotillo, is a toxic Rhamnaceae shrub/small tree native to southern US and Mexico.
Prairie Junegrass
Koeleria macrantha (Ledeb.) Schult.
Koeleria macrantha is a short perennial bunchgrass widespread across Eurasia and North America, used as forage and by humans for food and materials.
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