Plants perennial; tightly cespitose, bases often bleached, without rhizomes.
Culms 20-65 cm tall, 1-4 mm thick at the base, erect, rarely geniculate
at the base, unbranched; internodes often in a sequence of 2 short and
1 long. Leaves mostly basal; sheaths usually shorter than the internodes,
glabrous, remaining intact at maturity; collars glabrous; ligules
0.2-0.3 mm; blades (3)5-15 cm long, to 1 mm wide, involute, rarely loosely
folded or flat, somewhat stiff and arcuate, bases glabrous abaxially, pale green.
Inflorescences paniculate or racemose, 10-30 cm long, 1-2 cm wide, slender,
lax; primary branches 3-5 cm, loosely appressed, without axillary pulvini,
with 2-5 spikelets. Spikelets appressed. Glumes usually unequal,
1-veined, acuminate or awned, awns to 4 mm, tan to dark brownish or purplish;
Lower glumes 6-9(11) mm; upper glumes 9-12 mm; calluses 1-2
mm; lemmas 5-7 mm, glabrous, brownish, without a column, the junction with
the awns not evident; awns subequal, 8-15 mm, loosely spirally contorted,
but not coiled, just above the base, ascending to spreading distally, not disarticulating
at maturity; anthers 3, 1-1.5 mm, brownish. Caryopses 3-4 mm, somewhat
lustrous, chestnut-colored. 2n = unknown.
Aristida gyrans is endemic to the southeastern United States, growing in
sandy pine woods and oak scrub. It differs from other species in the genus by
its combination of narrow blades, unequal glumes, long calluses, and contorted