Schoenus nigricans L. it is a non-rhizomatous perennial herbs. Stems densely tufted, erect c. 15-60 cm, glabrous. Leaves basal, narrow, filiform. grooved. about 1̸2 as long as the stem; sheaths enclosing 5-6 cm of the stem. Inflorescence terminal supported by 2 dark brown bracts, inflated below and scabrous at the top; the inferior bract is much longer than the inflorescence, c. 3.5-8.5 cm long. The superior one is much shorter, 0.5-2 cm long. Spikelets, 5-15. sessile or sub sessile, oblong-lanceolate. Rachis wingless, glabrous. Glumes 6-7 lanceolate, keeled, 1-nerved, slightly scabrous on the keel. The inferior ones sterile while the 1-3, superior ones fertile. Perianth bristles 3-6; brown, shorter than the achenes. Stamens 3, anticous, filaments brown; anthers linear, yellow 3.5-7 mm, the connective prolonging into a mucro, c. 0.7 mm long. Style 6 mm long. Stigmas 3, papillose. Achene trigonous, whitish obovate to obovate-oblong 1̸3 of the glume length.
Flowering in: Apr-Des.
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