Cyperus concinnus

Tufted perennial with very short rhizome. Culms trigonous, scabrous above, slightly swollen at base, 15–65 cm high, 1–3 mm diam. Leaves not septate-nodulose, shorter or a little longer than culms, 1–2 mm wide. Inflorescence compound with 3–5 primary branches to 4 cm long; digitate clusters to c. 1 cm diam.; involucral bracts leaf-like, 1–3 much exceeding inflorescence. Spikelets flattened, 1–6 per cluster, 4–10 mm long, 1.5–2.5 mm wide in side view, 12–32-flowered; rachilla not winged, persistent; glumes obtuse or almost acute, with sides not nerved, dark red-brown to blackish, c. 1.5 mm long; stamens 3. Nut trigonous, ellipsoid to ovoid, pale brown, less than half as long as glume, c. 0.5 mm long, c. 0.4 mm diam. Flowers spring–summer.