2,112 articles
Thevetia
Thevetia (syn. Cascabela in part) is a small Apocynaceae genus native from Mexico to southern tropical America and Cuba, with three accepted species; its best-known member, the yellow oleander (Cascabela thevetia, syn. Thevetia peruviana), is a poisonous ornamental containing cardiac glycosides such as thevetin and peruvoside.
Thistle
Thistle: spiny Asteraceae plants, chiefly Cirsium plus Carduus, Onopordum, and Silybum. Covers evolution, weedy Canada thistle biology, organic and grazing management, biocontrol risks, native thistle ecology, and milk thistle's medicinal use.
Thlaspi
Thlaspi L. is a small genus of Brassicaceae herbs native to temperate Eurasia, published by Linnaeus in 1753 with 9 accepted species; formerly broad Thlaspi s.l. was split into Noccaea, Microthlaspi, and other genera.
Thlaspi arvense
Thlaspi arvense, field pennycress or stinkweed, is a Eurasian mustard-family annual weed of cropland being domesticated in the US Midwest as a winter annual oilseed cash cover crop for corn-soybean rotations and aviation biofuel.
Thunbergia
Thunbergia (Acanthaceae, Thunbergioideae) is a genus of 100–150 twining Old World tropical plants named for Carl Peter Thunberg; includes ornamentals T. alata and T. laurifolia, medicinal rang jued, and invasive T. grandiflora.
Thyme
Thyme (Thymus spp., especially Thymus vulgaris) is a Mediterranean Lamiaceae herb used as a culinary seasoning and herbal medicine; thymol-rich essential oil, EU traditional-use status for productive cough, about 220 species.
Thymelaea
Thymelaea Mill. (Thymelaeaceae, Malvales): a genus of about 30 Mediterranean xerophyllous shrubs and herbs, sister to Daphne, type T. sanamunda, with daphnane diterpenes and dry fruits.
Thymelaeaceae
Thymelaeaceae (daphne family) is a Malvales family of about 46-50 genera and 890-900 species of trees and shrubs with fibrous bark, no stipules, and tubular flowers; includes Daphne, Aquilaria (agarwood), Gnidia, Pimelea.
Thymus pulegioides
Thymus pulegioides (large thyme, lemon thyme) is a European Lamiaceae subshrub of section Serpyllum, subsection Alternantes, chemically polymorphic with carvacrol, thymol, geraniol, and linalool chemotypes, used in traditional medicine.
Thymus serpyllum
Thymus serpyllum L. (wild thyme, breckland thyme, creeping thyme) is a mat-forming Lamiaceae subshrub native from Europe to western Siberia, used since antiquity for its thymol- and carvacrol-bearing essential oil and in traditional respiratory and gastrointestinal medicine.
Thymus vulgaris
Thymus vulgaris (common thyme, garden thyme) is a Mediterranean Lamiaceae subshrub used as a culinary herb and medicinal plant; six chemotypes, thymol-rich essential oil, EMA and European Pharmacopoeia monographs.
Tibouchina
Tibouchina (glorytree) is a Neotropical Melastomataceae genus, native S. Mexico to S. Tropical America, with 38 accepted species after the 2019 split into Pleroma, Chaetogastra, and Andesanthus; bee-pollinated, with T. herbacea invasive in Hawaii.
Tilia
Tilia (linden, lime, basswood) is a genus of about 33 accepted Malvaceae tree species native to the temperate Northern Hemisphere, with heart-shaped leaves and bracted flowers, valued for honey, carving wood, and top-rated urban UV reduction but drought- and salt-sensitive.
Tilia cordata
Tilia cordata Mill., small-leaved lime or littleleaf linden, is a Malvaceae tree native from Europe to Central Siberia and N. Iran, with heart-shaped 3–8 cm leaves, erect fragrant yellow flower clusters, insect pollination, 500-year lifespan, and IUCN least concern status.
Tilia platyphyllos
Tilia platyphyllos, large-leaved lime or bigleaf linden, a European Malvaceae tree up to 35 m; hexaploid 2n=82; parent of Tilia × europaea hybrid with T. cordata; nectar-rich flowers, IUCN Least Concern.
Tinospora
Tinospora (qing niu dan shu, 青牛胆属) is a genus of about 34 Menispermaceae climbing vines of the Old World tropics; includes the medicinal species T. cordifolia (Giloy/Guduchi), T. crispa (makabuhay), and T. sinensis, distinguished by chemical markers and stem anatomy.
Tinospora cordifolia
Tinospora cordifolia (giloy, guduchi, heart-leaved moonseed) is an Ayurvedic medicinal liana of Menispermaceae native to the Indian subcontinent, used for diabetes, fever, and immunity, with documented alkaloids like berberine and a LiverTox score A for liver injury.
Tithonia
Tithonia (Mexican sunflower genus) is a genus of 12 Asteraceae species native from Arizona to Central America; T. rotundifolia is a garden ornamental and T. diversifolia a green manure and invasive weed.
Tithonia diversifolia
Tithonia diversifolia, known as the Mexican sunflower or tree marigold, is a yellow-flowered daisy-family shrub native to Mexico and Central America, used as medicine, forage, and green manure.
Toona
Toona is a small genus of deciduous trees in the mahogany family Meliaceae, native from China through tropical Asia to eastern Australia and grown for its light, fragrant red timber.
Toona ciliata
Toona ciliata, known as Australian red cedar or toon, is a large deciduous timber tree in the mahogany family, native from southern China to eastern Australia.
Toxicodendron
Toxicodendron, the poison ivy, poison oak, and poison sumac genus of Anacardiaceae, comprises about 33 species disjunctly distributed in East Asia and North America; all contain urushiol, causing allergic dermatitis, and some yield lacquer.
Toxicodendron diversilobum
Toxicodendron diversilobum, western or Pacific poison oak, is a deciduous Anacardiaceae shrub or vine native from British Columbia to northern Mexico whose urushiol oil causes allergic contact dermatitis in 10 to 50 million Americans yearly.
Toxicodendron radicans
Toxicodendron radicans, eastern poison ivy (formerly Rhus radicans), is a North American Anacardiaceae vine or shrub with three leaflets whose urushiol causes allergic contact dermatitis in most people.
Toxicodendron vernix
Toxicodendron vernix (poison sumac, swamp sumac, thunderwood), basionym Rhus vernix, is a wetland Anacardiaceae shrub of eastern North America with 7-13 leaflets on red stalks and urushiol in all parts causing allergic contact dermatitis.
Trachelium
Trachelium (blue throatwort, throatwort) is a small Campanulaceae genus of Macaronesia and the western Mediterranean; Trachelium caeruleum is a violet-blue garden perennial and cut flower with a two-week vase life.
Trachelospermum jasminoides
Trachelospermum jasminoides (络石, teikakazura), star jasmine or confederate jasmine, is an evergreen Apocynaceae liana native from Japan to Vietnam, grown for fragrant white flowers and used in Chinese medicine as caulis trachelospermi.
Trachyspermum
Trachyspermum (ajwain, Trachyspermum ammi) is a genus of Apiaceae herbs, published by Link in 1821, native from NE Africa to Central Asia; 15 accepted species, polyphyletic, seeds used as spice and medicine.
Tragopogon
Tragopogon is a genus of about 130 daisy-family herbs native to temperate Eurasia, the Canary Islands, and North Africa, known for salsify and dandelion-like wind-dispersed fruits.
Tragopogon porrifolius
Tragopogon porrifolius, salsify or oyster plant (Tragopogon sativus), a purple-flowered biennial Asteraceae native from the Canary Islands to the Arabian Peninsula, grown for its oyster-flavored taproot and naturalized widely as a mild weed.