Cyperus sphaeroideus

Slender perennial with long slender rhizome. Culms trigonous, smooth, to 50 cm high, c. 1 mm diam. Leaves not septate-nodulose, shorter than culms, 2–3 mm wide. Inflorescence head-like, globose, always solitary, 4–7 mm diam.; involucral bracts leaf-like, 2–4 exceeding inflorescence. Spikelets flattened, from very few to 50 per head, c. 3 mm long, c 1 mm diam., 1–2-flowered, falling as unit; glumes short-mucronate, with smooth or slightly toothed keel, with sides several-nerved, whitish to pale brown, often tinged golden, 2–3.5 mm long; stamens (2–)3. Nut biconvex, obovate, pale brown, c. one-half as long as glume, 1–1.3 mm long, 0.7–0.8 mm wide. Flowers spring–summer.