Publication: Syn. Pl. Glumac. 1: 164. 1854.
selected vouchers: WTU
Notes: FNA24: "Agrostis microphylla grows in thin, rocky soils, sandy areas, cliffs, vernal pools, and serpentine areas. It is a winter annual, flowering in late winter to spring, adapted to low-competition habitats with summer drought. It may be related to, or conspecific with, A. hendersonii.
Agrostis microphylla grows mostly along the Pacific coast from British Columbia to northern Baja California, Mexico. Reports of A. microphylla from the Humboldt Mountains, Nevada, reflect Vasey's treatment of a specimen of A. exarata as the type of a new variety, A. microphylla var. major Vasey."