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Published In: Species Plantarum 2: 562. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: I.C. Hedge
General/Distribution: A large ± cosmopolitan genus (probably of more than 200 species) distinguished from other Labiate genera by the non-gynobasic style and the apparently unilabiate corolla of one large 5-lobed lower lip. Its closest ally is Ajugo.


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Perennial, herbaceous or suffruticose herbs. Stems erect or ascending, leafy, with eglandular hairs, or with glandular hairs on inflorescence axis. Leaves petiolate or sessile, not divided, margins subentire to crenate-dentate. Inflorescence of pedunculate cymes or verticillasters, distant or condensed into spikes or heads. Calyx tubular or campanulate, 10-nerved, bilabiate or regular; tube within glabrous or pilose at throat; teeth 5, equal or unequal. Corolla of 1 spreading 5-lobed lower lip (the adaxial lip represented by 2 lobes at the base of the abaxial lip); tube short, not annulate within. Stamens 4, exserted, didynamous; thecae bilocular, becoming confluent, glabrous. Style exserted, not gynobasic; stylar branches unequal or subequal. Nutlets ovoid or obovoid, rounded, with a lateral oblique attachment scar, reticulate-rugose.

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1 Herbaceous perennials with green or purplish stems; inflorescence elongated (2)
+ Tufted suffruticose herb with whitish stiff stems; inflorescence of compact oblong or ovoid heads 1 Teucrium stocksianum
2 (1) Calyx teeth markedly unequal; flowers + crowded, borne in axils of upper leaves or not; bracts present; plants of dry ground (3)
+ Calyx teeth subequal; flowers distinct, all borne in axils of distant leaves; bracts absent; slender plant of damp or wet places 2 Teucrium scordium
3 (2) Flowers in terminal 4-ranked racemes; bracts large imbricate, ovate-cordate, often purplish 4 Teucrium quadrifarium
+ Flowers borne in pedunculate cymes in upper leaf axils, + secund; bracts linear 3 Teucrium royleanum
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