Plants — 23,508 Species

Wild Service-tree

Torminalis glaberrima (Gand.) Sennikov & Kurtto

Torminalis glaberrima, the wild service tree, is a rare deciduous hardwood tree native to Europe, northwest Africa, and southwest Asia.

Toru

Toronia toru (A.Cunn.) L.A.S.Johnson & B.G.Briggs

Toronia toru is the only species in the Proteaceae genus Toronia, an evergreen tree endemic to the northern North Island of New Zealand.

California torreya

Torreya californica Torr.

Torreya californica is a rare relict evergreen conifer native to California mountains, with edible cooked seeds and useful durable wood.

pale false mannagrass

Torreyochloa pallida (Torr.) Church

Torreyochloa pallida is a rhizomatous perennial grass native to wet habitats in North America with three recognized varieties.

Wall Screw-moss

Tortula muralis Hedw.

Tortula muralis Hedw. is a cosmopolitan moss with small greyish-green cushions that commonly grows on urban hard surfaces.

sea lavender

Tournefortia gnaphalodes (L.) R.Br.

Tournefortia gnaphalodes is a coastal semi-succulent evergreen flowering shrub in the Boraginaceae family, sometimes cultivated ornamentally and used for dune stabilization.

Siberian Sea-rosemary

Tournefortia sibirica L.

Largeflower Ground-Daisy

Townsendia grandiflora Nutt.

Townsendia grandiflora is a small short-lived herb native to the western US, grown in rock gardens with large showy flower heads.

Hooker's Townsend-daisy

Townsendia hookeri Beaman

Townsendia hookeri is a mat-forming North American Rockies native early-spring flowering plant that can be distinguished from similar T. exscapa by specific bract and pappus traits.

Pacific poison oak

Toxicodendron diversilobum (Torr. & A.Gray) Greene

Western poison oak, Toxicodendron diversilobum, is a variable North American plant that causes allergic contact dermatitis in most humans.

Atlantic poison oak

Toxicodendron pubescens Mill.

Toxicodendron pubescens (Atlantic poison oak) is a poisonous shrub native to the Southeastern US, whose urushiol causes severe skin irritation in sensitive people.

eastern poison ivy

Toxicodendron radicans (L.) Kuntze

Toxicodendron radicans, poison ivy, is a toxic North American plant that causes allergic contact dermatitis via urushiol.

western poison ivy

Toxicodendron rydbergii (Small ex Rydb.) Greene

Toxicodendron rydbergii is a urushiol-containing toxic North American shrub related to eastern poison ivy that causes contact dermatitis.

Japanese wax tree

Toxicodendron succedaneum (L.) Kuntze

Toxicodendron succedaneum is an Asian flowering wax tree with ornamental, industrial, and medicinal uses, classified as a noxious weed in Australia and New Zealand.

poison sumac

Toxicodendron vernix (L.) Kuntze

Toxicodendron vernix (poison sumac) is a more toxic North American wetland shrub/tree that causes allergic contact dermatitis via urushiol.

Fremont's Death Camas

Toxicoscordion fremontii (Torr.) Rydb.

Toxicoscordion fremontii is an attractive bulbous wildflower that grows in western North America, with star-shaped clustered flowers.

Nuttall's Deathcamas

Toxicoscordion nuttallii (A.Gray) Rydb.

Toxicoscordion nuttallii is a poisonous bulb-forming herb native to the south-central United States.

foothill deathcamas

Toxicoscordion paniculatum (Nutt.) Rydb.

Toxicoscordion paniculatum (foothill death camas) is a poisonous North American flowering bulb occasionally grown in cultivation.

Meadow Deathcamas

Toxicoscordion venenosum (S.Watson) Rydb.

Toxicoscordion venenosum (meadow death camas) is a highly toxic North American bulb plant pollinated by a toxin-tolerant specialist bee.

Throatwort

Trachelium caeruleum L.

Trachelium caeruleum (blue throatwort) is a Mediterranean flowering plant widely cultivated for gardens, with many color cultivars.

Asiatic jasmine

Trachelospermum asiaticum (Siebold & Zucc.) Nakai

Trachelospermum asiaticum is a hardy fragrant evergreen climber native to East and Southeast Asia, widely cultivated for gardening.

Star jasmine

Trachelospermum jasminoides (Lindl.) Lem.

Trachelospermum jasminoides is an evergreen woody liana grown ornamentally and used for perfume, incense, and fiber.

Chusan Palm

Trachycarpus fortunei (Hook.) H.Wendl.

Trachycarpus fortunei, the windmill palm, is a hardy dioecious fan palm widely cultivated as an ornamental.

Australian parsnip

Trachymene incisa Rudge

Trachymene incisa (wild parsnip) is a native Australian perennial herb whose roots are a traditional Aboriginal bushfood.