PIPTOCHAETIUM Presl Needlegrass
Plants hermaphroditic, caespitose, perennial. Culms erect or ascending, nodes glabrous or hairy; internodes hollow, terete.
Leaves basal, not distinctly distichous; sheaths terete, margins open; auricles absent; ligules membranous; blades flat or
involute, linear (narrow), lax. Panicles open or contracted; primary branches ascending , terminating in a spikelet.
Spikelets solitary, terete or laterally compressed, disarticulation above the glumes, awned, pedicellate;
florets 1, reduced floret absent, callus hairy; rachilla not extended beyond upper floret; glumes 2 (acuminate),
3-7-veined, equal, longer than first floret, hairy or glabrous, awnless; lemmas 5-veined (veins inconspicuous),
coriaceous or indurate, margins involute and fitting into palea groove, glabrous or hairy; apex obtuse to truncate, fused,
awned; awns (1) apical, curved or geniculate; paleas 2-veined (relatively long), longer than lemma, longitudinally
grooved, awnless or mucronate, glabrous. Stamens 3; anthers yellow. Caryopses fusiform. Base chromosome number x=11.
A New World genus of about 30 species. These grassland species are either mesic or xeric species of open