Coelorachis rugosa (Nutt.) Nash
Family: Poaceae
Coelorachis rugosa image

Plants cespitose. Culms 60-120 cm, compressed-keeled. Sheaths compressed-keeled; ligules 0.5-1 mm. Rames 3-9.5 cm; rachises distinctly indented adjacent to the sessile spikelets. Sessile spikelets 3-4 mm; lower glumes transversely rugose; upper lemmas and paleas 2-3 mm. Pedicellate spikelets 1-3 mm. Caryopses about 2 mm, broadly ellipsoid. 2n = unknown.

Coelorachis rugosa is endemic to the southeastern United States. It grows in moist to wet areas in prairies, bogs, and pine woods, especially flatwoods and savannahs.

Culms 6-10 dm, usually branched above; sheaths overlapping, narrowly but sharply keeled; blades usually folded, 4-8 mm wide; racemes slender; 3-8 cm, exserted or partly included in the subtending sheath; sessile spikelet 4-5 mm, usually surpassing the adjacent internode; its first glume coarsely transversely wrinkled on the back, narrowly 2-winged toward the summit, often notched; sterile spikelet 3-4 mm, often divaricate when dry, together with its pedicel (2-3 mm) conspicuously exceeding the fertile one. Wet pine-barrens; s. N.J. to Fla. and Tex. (Manisuris r.; Rottboellia r.)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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