Annuals (2–) 8–13 (–30) cm tall, caespitose, scabrid. Leaves basal, c. 1.5–8 cm long, filiform to flat, usually 0.8–2.0 mm wide; base often purplish with margins dilated, membranous; apex acute. Stem ±grooved, scabrid with ±evenly scattered to dense low papillae. Lower bract usually membranous, rarely partially herbaceous, usually to 1 (–4) cm long, shorter than inflorescence; capitulum bracts membranous, to c. 3 mm long. Inflorescence of 1 sessile and (0–) 1–6 (–10) hemispheric to ±globose usually (1–) 3–8 (–15)-flowered heads; peduncles to 3.5 (–4.5) cm long, scabrid. Tepals ±equal to unequal, outer ±lanceolate; inner tepals usually longer, ovate-lanceolate, subacute to mucronate, c. 3.5–4.5 mm long; margins ±membranous; median part pale greenish to straw-brown, scabrid, with most of the area between margins and centre usually blackish purple to dark castaneous-brown. Stamens 6; anthers 1.2–1.7 mm long; filaments 0.4–0.6 mm long; style 1.0–2.3 mm long; stigmas (1.5–) 2.5–4.5 mm long, red, exserted. Capsule oblong-ovoid, subacute to subacuminate, c. 2.3–2.8 mm long including mucro 0.2–0.4 mm long, shorter than perianth, usually pale brown. Seeds ±ovoid, apicate, c. 0.3–0.4 × 0.2 mm, pale brown to brown, distinctly reticulate.