Herbs, annual, cespitose, 0.1–0.55(–0.65) dm. Culms to 100. Leaves to 2.5 cm × 0.1–0.3 mm. Inflorescences terminal clusters, each with 1–4 flowers; bracts subtending inflorescence 2–5, ovate to lanceolate, inconspicuous, 1–2.5 mm, membranous, apex acute to obtuse. Flowers 3-merous; : tepals dark reddish brown, 2–3.2 × 0.4–1 mm, margins unpigmented; inner series nearly equal to or slightly shorter than outer series, acute to acuminate; stamens 3, filaments 0.7–1.3 mm, anthers 0.3–0.5 mm; style 0.2–0.5 mm, stigma 0.4–1.3 mm. Capsules dark reddish, 3-locular, obovoid to ellipsoid, nearly equal to tepals, 1.8–2.9 × 1.2–1.6 mm. Seeds ovoid, 0.4–0.55 mm, apiculate. n = 17.
Phenology: Flowering and fruiting spring–early summer.
Habitat: Sandy and clayey damp soils around vernal pools, seepage areas, and low spots in fields and meadows
Elevation: 0–800 m
B.C., Calif., Nev., Oreg., Wash.