T: Russia, Sarepta, 24 May 1851, A.Becker; holo: LE.
Annuals, (2–) 5–40 (–45) cm tall, caespitose; stems erect to ascending. Basal leaves few, often cataphyllous; cauline leaves 1–3 (–5), 1–12 cm long, c. 0.5–1.5 mm wide, flat to sub-canaliculate; auricles absent. Lower bracts herbaceous, usually shorter than or rarely exceeding inflorescence. Inflorescence constitutes c. 1/2–3/4 of plant height, usually ±lax, open, rarely subcontracted; branches ±suberect; flowers borne singly or seldom in few-flowered loose clusters. Bracteoles ovate, c. 1.5–2.5 mm long, acute, scarious. Tepals unequal, broadly lanceolate; central band usually greenish; margins broad, membranous; outer tepals longer, acuminate, 4.0–7.5 mm long; inner tepals acute, c. 3.5–6.0 mm long. Flowers cleistogamous or chasmogamous. Stamens 6, rarely to 3, usually less than 1/2 as long as tepals; anthers variable in length, (0.3–) 0.5–1.0 (–1.2) mm long, c. 0.5–1.0× as long as c. 0.7–0.9 mm filaments; style c. 0.4–0.5 mm long; stigmas ±patent, c. 1.0–1.5 mm long. Capsule narrowly ovoid to subellipsoid, c. 3.5–5.0 mm long, usually shorter than inner tepals, usually acute to subacute, with mucro c. 0.1–0.2 mm long. Seeds barrel-shaped, 0.40–0.50 × c. 0.25–0.35 mm, usually pale brown, ±smooth or very faintly reticulate. 2n = 108, fide T.A.Cope & C.A.Stace, Watsonia 15: 311 (1985); 2n = c. 108 (104–110), fide T.A.Cope & C.A.Stace, Watsonia 12: 121 (1978); N.A.Harriman & D.Redmond, Rhodora 78: 731 (1976).