Aristida oligantha is an annual C4 grass, 20-40 cm tall, pale green, wispy, loosely tufted, branching from most nodes.
Leaves 0.1 cm wide, tapered to a thread-like point.
Flower spikelets 1-flowered, single or in pairs, linear, 1st glume 3 or 5-veined, short-awned, 0.1-0.3 cm, second 1-veined, slightly shorter, lemma 1.0-1.8 cm, 3-awned, awns divergent, 4-7 cm, terminal inflorescence few flowered; blooming and fruiting Aug-0ct.
Wetland status: NL.
Frequency in NYC: Very infrequent.
Origin: Midwestern US.
Habitat: Dry, open areas, sandy soil.