Herbs, perennial, emerging from filiform reddish rhizomes. Stems weak but generally erect, 10-45 cm tall, 4-angled, glabrous and smooth, except hispidulous at nodes. Middle stem leaves and leaflike stipules in whorls of (6 or)7 or 8, subsessile to very shortly petiolate; blade drying papery or membranous, remaining green, elliptic to narrowly oblong-oblanceolate or lanceolate, (10-)20-50(-60) × 3-13 mm, length/breadth index mostly 3.5-4.5, glabrescent, base acute or cuneate, midrib smooth or rarely retrorsely aculeolate, margins and upper leaf side with antrorse microhairs, apex obtuse or rounded and abruptly apiculate; vein 1. Inflorescences terminal and sometimes in axils of upper leaves with few-to several-flowered cymes; axes glabrous, smooth; bracts none or few, 1-2 mm; pedicels 0.5-5 mm. Ovary ovoid, 0.5-0.8 mm, with uncinate trichomes. Corolla white or light greenish, rotate, 2.5-3.8 mm in diam., lobed for 3/4 or more; lobes 4, ovate, acute. Mericarps ellipsoid, 1.8-2.5 mm, with dense uncinate trichomes 0.6-0.8 mm, on fruiting pedicels elongating to 10 mm. Fl. Apr-Aug, fr. May-Sep.
Home