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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

Subshrubs or perennial herbs, stems erect, virgate, internodes elongate, strongly 4-angled; leaves narrowly linear to linear-lanceolate, distant and sometimes reduced; inflorescences of few-flowered cymes, sessile or shortly pedunculate in axils of bracts, forming terminal, spiciform, interrupted or congested thyrse; bracts inconspicuous; bracteoles inconspicuous; calyx elongate, narrowly cylindrical, rarely shorter, narrowly infundibuliform, weakly 2-lipped, 5-lobed (3/2), lobes usually subequal, shorter than tube (except in R. strictus ), triangular to subulate, tube 13-14-nerved, nerves prominent, throat densely annulate within; corolla white, cream, lavender or red, 2-lipped, 5-lobed (2/3), lips subequal, or posterior lip longer, both usually shorter than tube, erect or anterior lip sometimes spreading, tube usually long-exserted from calyx, slightly curved, widening gradually above, glabrous to slightly hairy towards base within; stamens 2 (posterior pair absent), filaments slightly arcuate, ascending, rarely slightly exserted from corolla, thecae equal, divaricate, or unequal, divergent, distinct, connective well-developed; disc symmetrical, 4-lobed; style glabrous; stigma-lobes unequal, posterior shorter; nutlets ovoid-oblong, smooth, not mucilaginous when wetted.  Seven species, central and southern Brazil, Paraguay and N Argentina. Savannahs and other open areas.

Distribution

Native to:

84 Brazil
85 Southern South America

Synonyms

Keithia Benth., Labiat. Gen. Spec.: 409 (1834), nom. illeg., non Spreng. (1822).

Publication

Rhabdocaulon (Benth.) Epling, Rep. Spec. Nov. Beih. 85: 134-137 (1936), rev., Rep. Spec. Nov. Beih. 115: 8 (1939).

Keithia sect. Rhabdocaulon Benth. (1834).

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Image resource

Royal Botanic Gardens, Kew