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Subfamily

VII. Subfam. Nepetoideae (Dumort.) Luerss. (1882).

VII. 2. Tribe Mentheae Dumort. (1827).

VII. 2. B. Subtribe Menthinae (Dumort.) Endl. (1838).

Description

Annual herbs, aromatic;leaves petiolate, coarsely toothed to subentire; inflorescence of verticillasters with cymes 3-5-flowered, in the axils of bracts, in a terminal, congested or interrupted spiciform thyrse; bracts leaf-like, toothed and often apically spinose; bracteoles conspicuous, 2 per cyme, broadly ovate to rotund, spinose-dentate, subsessile, green or straw-coloured, equalling or overtopping calyx; calyx 2-lipped, 5-lobed (3/2), lobes subequal, triangular-lanceolate, spinose-tipped, posterior lip longer than anterior with shallower sinus between teeth, tube 13-nerved, cylindrical-campanulate, exannulate within; corolla white or pink, 2-lipped, 4-5-lobed (1-2/3), posterior lip concave, erect, anterior lip usually longer, broad, spreading, median lobe longer than laterals, often emarginate, tube narrowly cylindrical, equalling to long-exserted from calyx; stamens 4, didynamous with posterior pair shorter, or 2 and then posterior pair staminodal, anterior pair ascending, included under posterior corolla lip, filaments glabrous, thecae divergent, distinct, sometimes unequal, glabrous or hairy, connective apparent; disc symmetrical; style hairy to glabrous; stigma-lobes unequal, subulate, posterior shorter; nutlets obovoid-oblong, smooth, mucilaginous. 2n = 19.  Four species , U.S.A. (California), one extending into Mexico (Baja California).  Open areas in rocky or clay soils.

Distribution

Native to:

76 Southwestern U.S.A.

Publication

Acanthomintha (A. Gray) Benth. & Hook. f., Gen. Pl. 2, 2: 1192 (1876); Gray, Syn. Fl. N. Amer. 2, 1: 365 (1878); Jokerst, Madroņo 38: 278-286 (1991), rev.

Image resource

Š Royal Botanic Gardens, Kew

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