ABCDEFGHIJKLMNOPQRSTUVWXYZ

Subfamily

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

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

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

Description

Rhizomatous perennial herbs, strongly aromatic, with simple hairs; leaves sessile or short-petiolate, ovate to lanceolate, elliptical or linear, variously toothed or entire; inflorescence of verticillasters, or capitate, or corymbiform, composed of compact or loose, terminal and upper-axillary glomerules (paired cymes); calyx actinomorphic to zygomorphic, not accrescent, cylindrical to tubular-campanulate, 10-13-nerved, 5-lobed, lobes triangular to ovate, lanceolate or aristate, all similar or anterior 2 more deeply cleft than posterior 3, throat glabrous; corolla usually white to lavender with purple spots, 2-lipped, posterior lip entire or emarginate, anterior lip 3-lobed, tube straight; stamens 4, didynamous or subequal, exserted or included, filaments glabrous, thecae parallel, separate at dehiscence; stigma-lobes unequal to subequal (rarely equal); disc symmetrical; nutlets ovoid to obloid, trigonal, smooth or rugose, glabrous or pubescent.  2n = 36, 38, 40, 72, 76, 78, 80, c. 108, 120 (x = 18, 19, 20).  Seventeen to 21 species < /STRONG >, SE Canada, E and central United States, one disjunct species in California; centre of diversity in SE U.S.  Most species occur in disturbed sites, naturally open habitats or forest edges.

Distribution

Native to:

72 Eastern Canada
74 North-Central U.S.A.
75 Northeastern U.S.A.
76 Southwestern U.S.A.
77 South-Central U.S.A.
78 Southeastern U.S.A.

Synonyms

Furera Adans., Fam. Pl. 2: 103 (1763).

Koellia Moench, Methodus: 407 (1794).

Brachystemum Michx., Fl. Bor.-Amer. 2: 5 (1803).

Tullia Leavenw., Amer. J. Sci. Arts 20: 343 (1830).

Pycnanthes Raf., New Fl. 4: 95 (1838).

Publication

Pycnanthemum Michx., Fl. Bor.-Amer. 2: 7 (1803), nom. cons; Grant & Epling, Univ. Calif. Publ. Bot. 20: 195-240 (1943), rev.

top

Image resource

Royal Botanic Gardens, Kew