Perennial, drying green to brown; stems slender, weak and straggling, to c. 80 cm long, 4-angled, glabrous, or scabridulous on margins. Lvs and stipules in whorls of 4-(6), subsessile or with petioles to 1 mm long, 4-17 × 0.8-1.5 mm, narrow-linear to narrow-oblanceolate; margins flat or revolute, sometimes scabridulous; apex obtuse or subacute. Lvs of uppermost nodes often smaller. Cymes fairly dense, glabrous, 2-4 from same axis, each with c. 5-10 fls, aggregated in panicles of up to 40 fls; peduncles of variable length, to 1.5 cm long; pedicels usually 0.5-2 mm long, moderately divaricating at fruiting; bracts at base of infl. leaflike, reduced or 0 in highest orders of branches. Corolla 2.5-3.5 mm diam., white; lobes broad-ovate or ovate-oblong, 3-nerved, acute or obtuse. Mericarps c. 1 mm diam., globular, ± papillate.