A. Spica-venti: annual; steins 1-2 feet high, slender, elegant; leaves narrow; panicle long, spreading, with slender, hair-like branches, and little shining spikelets, the outer pales with a hair-like awn, three or four times their own length. - Fields and sandy pastures. Fl. June, July.

A. interrupta has the spikelets shorter and more crowded, in a narrow panicle, with nearly erect branches. - Sandy fields.