Herbs, perennial, weak to procumbent, from slender rhizomes. Stems (7-)10-40(-60) cm, 4-angled, caespitose, glabrous and smooth to sparsely retrorsely aculeolate on angles. Leaves in whorls of 4(-6), subsessile; blade drying papery, blackish or green, linear-lanceolate to oblanceolate, 3-8(-10) × 1-2 mm, glabrous and smooth to sparsely retrorsely aculeolate on margins and midrib, base acute to attenuate, apex rounded or obtuse; vein 1. Inflorescences terminal and axillary, cymes 1-3.5 cm, with 1-3(or 4) flowers; peduncles glabrous and smooth; bracts oblanceolate to narrowly elliptic; fruiting pedicels (3-)5-8(-10) mm, straight and ± divaricate. Ovary didymous, glabrous, smooth. Corolla white, cup-shaped to slightly campanulate, 1-1.8 mm in diam.; lobed to 1/2 or slightly more; lobes 3(or 4), ovate and rounded at tip. Fruit markedly didymous, mericarps (sub)globose, 2-2.8 mm, glabrous, smooth to slightly tuberculate. Fl. and fr. Mar-Aug.
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