Blown Grass; Fairy Grass
Annual or perennial grass to 80cm tall. Leaves with a hairless or rough sheath at the base. Ligule a membrane without a rim of hairs. Leaves 8-30cm long, 1-5mm wide, threadlike, flat, or folded together lengthwise, surface rough, with a straight point. Spikelets pale green, 2-5mm long. Mature seed groups spreading. Seeds with one short awn.
Description and photo of seeding plant (as Agrostis avenacea) in G.M. Cunningham, WE Mulham, PL Milthorpe and J H Leigh (1981 and later printings) Plants of Western New South Wales page 52
ausgrass2 description, photos, and line drawings: http://ausgrass2.myspecies.info/content/lachnagrostis-filiformis