T: USA, California, Solano Co., Suisun, 5 May 1890, E.L.Greene s.n.; lecto: NDG, fide B.J.Ertter, Mem. New York Bot. Gard. 39: 70 (1986); iso: DS, F, NA, NDG, UC, US [Material from the same date in LD].
Annuals, 0.8–3.2 (–4) cm tall. Stem erect, leafless, (0.1–) 0.2–0.4 (–0.5) mm thick; culms not dilated just below flower; basal leaves to 2.2 cm long. Flowers single, mostly trimerous; bract solitary, broadly truncate, completely enwrapping culm, unpigmented, 0.25–0.9 mm long; pedicels to 0.5 mm long. Tepals ±lanceolate, (1.7–) 2.1–3.8 (–5.3) mm long, 0.6–0.9 mm wide, subequal or inner to 0.3 (–0.7) mm shorter or rarely to 0.3 mm longer than outer, usually ±acute, erect to recurved, sometimes slightly incurved; central band usually remaining green, occasionally turning reddish. Stamens 2–3, 1.2–2 (–3) mm long; anthers 0.3–0.5 (–0.8) mm long, c. 1/3 filament length; style 0.1–0.3 mm long; stigmas 0.4–1.3 mm long, white. Capsule ovoid to ellipsoid, subequalling the tepals or shorter by up to 0.5 mm, (1.2–) 1.8–3.2 (–4) mm long, remaining greenish or more commonly turning reddish to deep maroon and then strongly contrasting with tepals. Seeds to 12 per row and c. 140 per capsule, ±ovoid, 0.3–0.4 mm long, sometimes apiculate or umbonulate, smooth or faintly reticulate. 2n = 32, fide B.J.Ertter, Mem. New York Bot. Gard. 39: 27 (1986).