Herbs delicate, perennial, creeping and rooting at nodes. Stems ascending, 20-45 cm tall, branched basally, subglabrous or finely puberulous. Petiole winged, to 7 mm; leaf blade ovate, 0.5-2.5 × 0.4-2 cm, glabrous, lateral veins 4-7 per side, submarginal vein absent, base abruptly attenuate, apex acute. Se-pals 4, deltoid-acute, 1-3 mm, very finely puberulous along margin. Petals absent. Stamens 4; filaments translucent, 0.5-0.8 mm, dilated below; anthers 0.6-0.9 mm, nearly basifixed; pollen in monads. Style green, 0.6-1 mm; stigma dark green, globose. Capsules elongate-globose, subterete, 3-5 mm, 2.5-3.5 mm in diam., finely puberulous, thinly walled, readily and irregularly loculicidal; subsessile or pedicel to 6 mm. Seeds in 2 or more rows per locule, free, reddish brown, apiculate, 0.7-0.9 mm, raphe inflated and triangular, 0.2-0.5 mm across, coarsely reticulate. Fl. Jul-Sep, fr. Jul-Oct. 2n = 32.
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