4,295 articles
The Orchid Thief
The Orchid Thief (1998) is Susan Orlean's Random House bestseller about orchid obsession and plant crime, centered on John Laroche's 1994 Fakahatchee Strand ghost orchid poaching arrest; basis for the 2002 film Adaptation.
Theaceae
Theaceae, the tea family (Camelliaceae), is an Ericales family of trees and shrubs including Camellia sinensis (tea), C. oleifera (oil), and ornamentals; eight accepted genera, Asia and the Americas, absent from Africa.
Thelymitra crinita
Thelymitra crinita, the Blue Lady or Queen Orchid, is a sky-blue sun orchid endemic to south-west Western Australia, described by Lindley in 1840, flowering September to December, pollinated deceptively by native bees.
Thelypteridaceae
Thelypteridaceae, the marsh fern family (Polypodiales), is a large cosmopolitan fern family of about 950 to 1,200 species, mostly tropical, with 37 genera recognized after the 2021 phylogenomic revision by Fawcett and Smith.
Thelypteridaceae of North America
Thelypteridaceae of North America describes the marsh and maiden fern family north of Mexico, where 3 genera and 25 species occur, mostly wetland ferns of marshes, bogs, and wet woods.
Thelypteridaceae of the Neotropics
Thelypteridaceae of the Neotropics surveys the marsh fern family across Central and South America and the Caribbean, where about 900 species show an Andean-centered diversity pattern.
Thelypteris
Thelypteris (marsh ferns) is a large, cosmopolitan genus of terrestrial ferns in Thelypteridaceae, established by Schmidel in 1763, with roughly 900–1,200 species and a controversial, much-split generic classification.
Thelypteris palustris
Thelypteris palustris, the marsh fern (eastern marsh fern), is a deciduous Thelypteridaceae wetland fern native from Central Canada to Mexico and temperate Eurasia, with subspecies palustris and pubescens, hairless pinnate fronds, and rounded sori.
Themeda
Themeda Forssk. is a genus of about 28 accepted C4 grass species in Poaceae, native from the Old World tropics to the SW Pacific. Its best-known species, Themeda triandra (kangaroo grass, red oat grass), is a dominant fire-adapted forage grass across Africa, Asia, and Australia.
Theobroma
Theobroma is a Neotropical genus of about 20-23 Malvaceae trees, named by Linnaeus in 1753 ('food of the gods'); type species T. cacao, source of chocolate, plus cupuaçu and pataxte.
Theobroma cacao
Theobroma cacao, the cacao or cocoa tree, is a Malvaceae evergreen whose seeds give chocolate. Upper Amazon origin, use from ~5,300 years ago, 71% of output from Africa, record 2023/24 prices.
Thesium
Thesium (Santalaceae) is a genus of about 350 root hemiparasitic herbs and shrubs described by Linnaeus in 1753, centered in southern Africa; Thesium chinense is its most-used medicinal species.
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.
Thinopyrum
Thinopyrum (wheatgrasses), genus of perennial Triticeae grasses erected by Á.Löve in 1980 with about 15 species; wild relatives of wheat valued for salt-tolerance genes and domesticated as the perennial grain Kernza (Th. intermedium).
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.
Thorns, spines, and prickles
Thorns, spines, and prickles are sharp plant defenses distinguished by origin: thorns are modified stems, spines modified leaves, prickles non-vascular epidermal outgrowths like those on roses, evolved mainly against large mammalian herbivores.
Threatened bryophytes and red-list assessment
Threatened bryophytes are mosses, liverworts, and hornworts whose extinction risk is assessed under the IUCN Red List, with criteria adapted for tiny clonal organisms; in Europe, 22.5% of assessed species are threatened.
Threatened quillworts
Threatened quillworts, genus Isoëtes (Isoetaceae), ancient aquatic and terrestrial lycopsids; about 38% of aquatic species threatened, with eutrophication, pollution, habitat loss, and drought driving declines in Europe, China, India, and North America.
Thuja
Thuja (arborvitae) is a genus of five evergreen conifer species in Cupressaceae, disjunctly distributed between East Asia and North America; includes western redcedar (T. plicata) and eastern arborvitae (T. occidentalis).
Thuja occidentalis
Thuja occidentalis, northern white-cedar or arborvitae, is a slow-growing, long-lived (over 800 years) North American conifer valued for decay-resistant wood, deer winter browse, and ornamental cultivars.
Thuja plicata
Thuja plicata, western redcedar (also Pacific redcedar, giant arborvitae, canoe-cedar), is the only Thuja native to western North America, a large decay-resistant conifer from Alaska to California central to Northwest Coast Indigenous cultures and timber.
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.