Poaceae

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Inflorescences

Dissections:
Erioneuron pilosum

ERIONEURON Nash
Plants hermaphroditic, caespitose or stoloniferous, perennial. Culms erect, glabrous; internodes solid, slightly flattened; Leaves basal; sheaths with compressed keels, margins open; auricles absent; ligules a ciliate membrane; blades folded (some involute), not pungent with white cartilaginous margins. Panicles or racemes short, contracted; primary and secondary branches ascending to appressed, terminating in a spikelet. Spikelets solitary, laterally compressed, pedicellate, pedicels without glands; disarticulation above glumes; florets 6 - 10, callus hairy; reduced florets at apex; glumes 1-veined, unequal to equal, shorter than or equal to spikelet length, glabrous; lemmas 3-veined, membranous, lobed or emarginate, awned from midvein, veins hairy to pilose near base; paleas 2-veined, awnless, ciliate. Stamens 1 or 3; anthers yellow. Caryopses terete, glossy and translucent. Base chromosome number x = 8.

A genus of about three species that are widely distributed in arid areas of the Southwest. These taxa frequent occur in open, rocky or sandy areas. This genus is closely related to Dasyochloa and Monroa based on cylology, morphology, and silica disposition (Valdes-Renya and Hatch, 1991).