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.
Hyacinth bean
Lablab purpureus (L.) Sweet
Lablab purpureus (hyacinth bean) is a variable multi-purpose pulse crop grown for food, forage, ornament, and medicine worldwide.
Common Laburnum
Laburnum anagyroides Medik.
Laburnum anagyroides Medik. is a small deciduous tree or large shrub grown as an ornamental, with poisonous seeds and multiple uses.
Canada wild lettuce
Lactuca canadensis L.
Lactuca canadensis L. is a variable North American wild lettuce, used for its sedative medicinal properties and edible young growth.
prickly lettuce
Lactuca serriola L.
Lactuca serriola is a wild lettuce with a variety of historical culinary and medicinal uses across different cultures.
Mountain Devil
Lambertia formosa Sm.
Lambertia formosa Sm., or mountain devil/honey flower, is a fire-adapted Australian endemic shrub cultivated for its bird-attracting red/pink flowers.
creeping lantana
Lantana montevidensis (Spreng.) Briq.
Lantana montevidensis is a trailing mat-forming shrub, widely cultivated ornamentally, invasive in some regions, toxic to livestock.
Creosote Bush
Larrea tridentata (DC.) Coult.
Larrea tridentata, or creosote bush, is a common evergreen desert shrub of western North America with a history of medicinal use.
Sweet pea
Lathyrus odoratus L.
Sweet pea (Lathyrus odoratus L.) is an annual scented flowering climbing legume native to southern Europe, widely cultivated for its fragrant colorful blooms.
spring vetch
Lathyrus vernus (L.) Bernh.
Lathyrus vernus is an early-flowering perennial plant native to Europe and northern Asia, with poisonous seeds in brown pods.
White leadtree
Leucaena leucocephala (Lam.) de Wit
Leucaena leucocephala is a small fast-growing tree with described traits, ecology, toxicity and varied promoted uses.
Summer snowflake
Leucojum aestivum L.
Leucojum aestivum is a poisonous perennial bulbous flowering plant cultivated as an ornamental.
Spring Snowflake
Leucojum vernum L.
Leucojum vernum L. is a poisonous spring-blooming bulbous European plant cultivated ornamentally, with white flowers.
Russian knapweed
Leuzea repens (L.) D.J.N.Hind
Leuzea repens (Russian knapweed) is a long-lived Eurasian perennial that is toxic to horses and widespread in most of North America.
Siberian Lyme Grass
Leymus racemosus (Lam.) Tzvelev
Leymus racemosus, or mammoth wild rye, is a perennial wild rye that provides useful stress-resistance genes for improving wheat cultivation.
Osha
Ligusticum porteri J.M.Coult. & Rose
Ligusticum porteri (osha) is a Rocky Mountain Apiaceae plant with traditional Native American medicinal uses.
garden privet
Ligustrum ovalifolium Hassk.
Ligustrum ovalifolium Hassk. is a widely cultivated hedge shrub or small tree that is poisonous to humans when ingested.
Chinese privet
Ligustrum sinense Lour.
Ligustrum sinense (Chinese privet) is a poisonous deciduous shrub, an invasive plant in southeastern North America, grown ornamentally and for hedges.
Common Privet
Ligustrum vulgare L.
Ligustrum vulgare L. (common privet) is a Eurasian shrub with selected cultivars, toxic berries, and a history of hedging use.
tiger lily
Lilium lancifolium Thunb.
Lilium lancifolium Thunb. is a true lily species that can reproduce sexually and asexually, with edible bulbs used for food in Asia.
Balkan toadflax
Linaria dalmatica (L.) Mill.
Linaria dalmatica (Dalmatian toadflax) is a short-lived perennial herb that is now classified as a weed in North America, with limited confirmed toxicity.
Purple Toadflax
Linaria purpurea (L.) Mill.
Linaria purpurea is a perennial poisonous herb, native to Italy, grown ornamentally, with potential as a natural anti-aflatoxin agent.
Pale Toadflax
Linaria repens (L.) Mill.
Linaria repens is a short rhizomatous herb that may be poisonous, growing across western Europe and introduced to the US east coast.
common toadflax
Linaria vulgaris Mill.
Linaria vulgaris Mill., common toadflax, is a perennial flowering plant with a long history of traditional medicinal uses.
Pantropical Widelip Orchid
Liparis nervosa (Thunb.) Lindl.
Liparis nervosa is a terrestrial tropical orchid that contains tumorigenic pyrrolizidine alkaloids.
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