Bog Yelloweyed Grass

Herbs, perennial, cespitose, (10--)15--70(--90) cm, base not bulbous. Stems compact. Leaves in narrow to broad fans, 5--50 cm; sheaths soft, base reddish; blade deep green, linear to linear---sword-shaped, flat, not twisted, under 7 mm wide, papillate or smooth, margins smooth or papillate, somewhat scabrous. Inflorescences: scape sheaths exceeded by leaves; scapes linear to filiform, terete proximally, terete or ancipital-2-edged--winged distally, 0.5--3 mm wide, variably ribbed, distally with 3 or more somewhat scabrous ribs, ribs papillate to scabrous; spikes prevalently ovoid, 5--20 mm, apex usually acute; fertile bracts (4--)5--7(--9) mm, margins entire, apex rounded. Flowers: lateral sepals included, slightly curved, 5--7 mm, keel brown, scarious, lacerate; petals unfolding in morning, blade obtriangular, 4 mm; staminodes bearded. Seeds translucent to mealy, ovoid to ellipsoid, 0.5 mm, finely lined longitudinally with small papillae.