VII. Subfam. Nepetoideae (Dumort.) Luerss. (1882).
VII. 2. Tribe Mentheae Dumort. (1827).
VII. 2. B. Subtribe Menthinae (Dumort.) Endl. (1838).
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.
84 Brazil85 Southern South America
Keithia Benth., Labiat. Gen. Spec.: 409 (1834), nom. illeg., non Spreng. (1822).
Rhabdocaulon (Benth.) Epling, Rep. Spec. Nov. Beih. 85: 134-137 (1936), rev., Rep. Spec. Nov. Beih. 115: 8 (1939).
Keithia sect. Rhabdocaulon Benth. (1834).
© Royal Botanic Gardens, Kew