小刺蕊草 xiao ci rui cao

Pogostemon fraternus Miquel.

Herbs procumbent or diffuse, perennial. Stems ascending, branched, purplish, basally rooting adventitiously, apex glandular hairy. Petiole 1-4 cm; leaf blade ovate to ovate-lanceolate, 2-5.5(-8) × 1.2-3.2 cm, ± membranous or papery, strigose or subglabrous, base rounded to subcordate, margin serrate to double serrate, apex acute to acuminate; lateral veins ca. 3-paired, rather conspicuous. Thyrse terminal, 5-16 cm, interrupted, glandular hairy, pubescent; verticillasters 5-11-flowered; peduncle 2.5 cm or more; bracteoles subsubulate, almost as long as pedicels, rigidly ciliate. Pedicel 2-4 mm. Calyx subtubular, 4-5 mm, glandular hairy, hirsute, ± 2-lipped, throat densely hispid annulate; teeth subulate to linear-subulate, margin minutely hispid, 3 of upper lip wider, 2 of lower lip slightly longer. Corolla purplish to 2 × as long as calyx, lobes subequal. Stamens bearded. Nutlets subglobose, flattened, adaxially veined. Fl. and fr. Mar-Apr.

Streamsides, wet areas in forests; 400-1200 m. Yunnan [India, Indonesia, Myanmar, Philippines, Thailand, Vietnam].