Plants perennial; loosely cespitose, bases knotty, sometimes shortly rhizomatous.
Culms (60)70-100 cm, stiffly erect, unbranched. Leaves cauline;
sheaths longer than the internodes, mostly glabrous, summit with hairs;
collars hispid, hairs 0.2-0.8 mm; ligules less than 0.5 mm; blades
20-55 cm long, 2-4 mm wide, light bluish-green, flat to loosely folded, glabrous
abaxially, scabridulous adaxially. Inflorescences paniculate, 30-50 cm
long, 15-25 cm wide; rachis nodes glabrous or with straight hairs shorter
than 0.5 mm; primary branches 8-22 cm, ascending to divaricate or drooping,
with axillary pulvini, basal portion without spikelets. Spikelets appressed
along the branches. Glumes brown to purplish, 1-veined, with a 1-2 mm awn;
lower glumes 10-13 mm, slightly longer than the upper glumes; calluses
0.5-1 mm; lemmas 10-12(15) mm, glabrous, light gray to brownish, narrowing
to a beak, beak less than 7 mm, not or only slightly twisted, junction with the
awns not conspicuous; awns unequal, not disarticulating at maturity; central
awns 20-25 mm, straight; lateral awns 3-10 mm, to 1/2 as long as and
about 1/2 as thick as the central awns, usually divergent; anthers 3, about
3 mm, yellow-green. Caryopses about 8 mm. 2n = unknown.
Aristida patula grows in sandy fields, low pinelands, and roadsides.
It is endemic to Florida.