Herbs, perennial, from filiform reddish rhizomes. Stems generally erect, (10-)15-30(-40) cm tall, 4-angled, glabrous and smooth, sometimes hispidulous at nodes. Middle stem leaves and leaflike stipules in whorls of up to 6 (in weak plants rarely only up to 4), with petioles up to 3 mm; blade drying papery or membranous, narrowly elliptic-oblong to broadly oblanceolate, (10-)15-30(-40) × (4-)5-10(-12) mm, length/breadth index mostly 2.5-3.5, glabrescent, smooth or rarely retrorsely aculeolate on abaxial midrib, base acute to obtuse, margins antrorsely aculeolate, apex obtuse to rounded and abruptly apiculate; vein 1. Inflorescences terminal and sometimes in axils of upper leaves, with few-to several-flowered cymes; peduncles glabrous, smooth; bracts none or few, 1-2 mm; pedicels 0.3-3 mm. Ovary obovoid to subglobose, 0.5-0.8 mm, strigillose with undeveloped trichomes. Corolla white or light green, rotate, 2.5-3 mm in diam., glabrescent, lobed for 3/4 or more; lobes 4, ovate, acute. Mericarps ellipsoid, 1.2-2 mm, with dense uncinate trichomes 0.8-1.2 mm, on pedicels elongating and up to 10 mm. Fl. Apr-Aug, fr. May-Sep.
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