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Dissections:
Setaria leucopila

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SETARIA P. Beauv. Bristlegrass
Plants caespitose or with short rhizomes, annual or perennial. Culm erect or ascending or geniculate, glabrous to scabrous; internodes solid or hollow, terete. Leaves not distinctly differentiated into two kinds (no basal rosette); basal and cauline, not distinctly distichous; sheaths terete; ligules a ciliate membrane, flat or involute. Panicles contracted, primary branches appressed, terminating in a bristle; bristles subtending some or all spikelets, terete, antrorsely and retrorsely barbed. Spikelets solitary, not embedded in branch, abaxial, planoconvex or terete; disarticulation below spikelets; florets 2; lower florets sterile and staminate or without stamens; upper florets fertile, equal to lower floret length; first glumes present, not fused with callus, encircling spikelet base, awnless; second glumes present, one third to equal spikelet length, not saccate, 3-9-veined; lemma of upper florets indurate, rugose, yellow, glabrous, margins involute, not differentiated at apex, awnless; palea of upper florets present. Stamens 3; anthers brown or yellow. Base chromosome number x=9,10.

A tropical or subtropical genus of about 100 species.