Annual; stems slender or filiform, much-branched, obtusely 4-angled, scabridulous, forming tangled masses to c. 30 cm long; rootstock slender. Lvs and stipules in whorls of 6, sessile, 2-9-(11) × 0.5-1.5-(2) mm, linear-lanceolate, narrow-elliptic, or oblanceolate, shining, usually revolute; margins and sometimes midrib beneath, as well as upper surface, densely antrorsely scabridulous; apex mucronate or shortly awned. Fls axillary and terminal, forming a rather narrow, loose panicle; cymes few-flowered, divaricating, glabrous or nearly so, subtended by leaflike bracts; peduncles long, filiform; pedicels < peduncles, to 3 mm long, ± deflexed at fruiting. Corolla 0.4-1 mm diam., greenish inside, reddish outside; lobes ovate, acute. Mericarps 0.5-1-(1.3) mm diam., subglobose to reniform, finely papillate, occasionally sparsely clothed in appressed hairs.
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