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Inflorescences

Dissections:
Dichanthelium oligosanthes

DICHANTHELIUM (A.S. Hitchc. & Chase) Gould Rosettegrass
Plants caespitose, perennial. Culms erect (vernal form) or mat forming (autuminal form), glabrous or pubescent or hairy; internodes solid or hollow, terete. Leaves of two kinds, basal short and wide (basal rosette present) and cauline narrow and linear or not differentiated into two kinds (basal rosette absent), not distinctly distichous; sheaths terete; ligules a line of hairs or membrane or ciliate membrane or absent; blades usually flat (broad or narrow). Vernal panicles open; primary branches spreading (secondary also spreading), terminating in a spikelet; autuminal panicles reduced and axillary (frequently with 3-7 spikelets), primary branches terminating in a spikelet; bristles absent below spikelets. Spikelets solitary, not embedded in branch, dorsiventrally compresssed; disarticulation below spikelets; florets 2; lower sterile and staminate or without stamens; upper fertile, more than eight tenths lower floret length; first glumes present (much shorter than second glume), not fused with callus, not encircling spikelet base or encircling spikelet base, awnless; second glumes present (about spikelet length), not saccate, 3- or 7- or 9-veined; lemma of upper florets indurate, smooth, yellow to green, margins involute, not differentiated at apex, awnless; palea of upper florets present. Stamens 3; anthers tan or golden brown or reddish brown. Base chromosome number x=9. Most taxa are 2n=18 with a few 2n=36.

A variable genus of 70 or more species mostly from temperate regions of the America's. Gould (1974) reduced the number of species significantly for North America. Hansen and Wunderlin (1988) refined Goulds work in treating Florida Dichanthelium. Some authors treat these taxa as a subgenus of Panicum. However, Dichanthelium is a C3 genus whereas "true" Panicum is C4.