Annuals, (0.5–) 5–20 (–35) cm tall, one-stemmed or caespitose. Basal leaves numerous, c. 2–10 cm long, (0.1–) 0.3–0.8 mm wide, ±canaliculate, acute; auricles developed, c. 0.5–1.0 mm long, oblong, obtuse; cauline leaves (0–) 1–2 (–3). Lower bract usually subherbaceous, to 1.5 cm long; middle bracts short, brownish membranous. Inflorescence constituting up to 1/3 of plant height, of umbelloid loose to subdense erecto-patent sickle-shaped cymes; flowers borne singly. Bracteoles ovate, obtuse, to c. 1 mm long, brownish, distally membranous. Tepals equal or outer ones slightly longer, ovate-lanceolate, ±acute to mucronate, c. 1.7–2.3 (–2.7) mm long. Inner tepals obtuse to mucronate, brown to castaneous-brown; central band often greenish or brownish; margins membranous. Stamens 6, c. half as long as tepals; anthers 0.2–0.5 mm long; filaments 0.4–0.6 (–0.8) mm long; style c. 0.1 mm long; stigmas c. 0.6 mm long. Capsule (subtrigonous-)globose, c. 1.5–2.1 mm long, obtuse to retuse, brown, usually shining. Seeds ovoid, 0.3–0.6 × c. 0.3 mm, distinctly longitudinally striate, reticulate.