Herb 1.5–8.5 cm high. Leaves linear, 0.6–5.5 cm long, 0.15–0.35 cm wide, 4–7-nerved, apex acuminate. Peduncle 1.5–8.5 cm long, ribs obscure. Sheath 6–25 mm long. Flower heads hemispherical, 1.5–4 mm long, 2.2–4 mm wide. Involucral bracts straw-yellow to hyaline, obovate or ovate to elliptic, 1.25–1.7 mm long, 0.6–1.3 mm wide, obtuse or rarely acute, glabrous, sterile, strongly reflexed at maturity. Floral bracts hyaline, mostly with stramineous or black apex, obovate to spathulate, 1–1.75 mm long, 0.6–1.1 mm wide, acute or obtuse, glabrous. Receptacle sparsely hairy, conical. Male flowers 0.75–1.3 mm long; sepals 2, fused but split on one side to form a spathe, hyaline, sometimes black at apex, 0.9–1.3 mm long, 0.4–0.66 mm wide, truncate, glabrous; petals 2, hyaline, dimorphic with petal in spathe opening larger, triangular, acute, glabrous; stamens 4; anthers black, often included. Female flowers: sepals 2, hyaline or straw-yellow with black window, equal, navicular, with broad dorsal wing, 0.75–1.1 mm long, 0.35–0.86 mm wide, crested to obtuse, pubescent with hyaline hairs adaxially or glabrous; petals 2, hyaline, equal, linear to spathulate, 0.8–1.2 mm long, 0.15–0.43 mm wide, acute to obtuse, glabrous; ovary 2–locular. Seeds 0.325–0.425 mm long, 0.25–0.275 mm wide; epidermal cells with even wall thickenings.
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