Poaceae

Pooideae

Chloridoideae
Aeluropodeae
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Bouteloua
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Arundinoideae

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Inflorescences

Dissections:
Bouteloua curtipendula

Bouteloua hirsuta

Line drawings

BOUTELOUA Lag. Grama
Plants hermaphroditic, caespitose or rhizomatous or stoloniferous, annual or perennial. Culms erect or ascending or mat forming or geniculate or decumbent, glabrous or hairy; internodes solid or hollow, terete. Leaves basal or basal and cauline, not distinctly distichous; sheaths terete, margins open; auricles absent; ligules a line of hairs; blades flat or folded or involute, linear, lax, apex acuminate. Panicles of 1-several spicate primary unilateral branches ; primary branches single or alternate, disarticutating at base of branch or not disarticulating at base of branch, terminating in a bare point. Spikelets solitary, laterally compressed, disarticulating above or below the glumes, awned, sessile or subsessile; florets 2-4, reduced floret at apex, rachilla not extended above upper floret, rudiment 3-awned; glumes 2, 1-veined, unequal, shorter or longer than first floret, glabrous or hairy, awnless or awned; lemmas 3-veined, membranous, apex 1-3 toothed, awned or awnless; paleas 2-veined, awnless, glabrous. Stamens 3; anthers reddish orange or yellow. Caryopses with pericarp adnate to seed coat, linear to ovate, brown. Base chromosome number x=10.

A New World genus of about 40 species with the distribution centered in northern Mexico. The grama grasses are generally considered important for livestock forage and as prominent in the environment.