Annual or perennial grass to 60cm tall. Leaves with a hairless or warty sheath at the base. Ligule a fringe of hairs. Leaves 2-7cm long, 1-2mm wide, threadlike, rolled, or with the edges rolled in, hairless or hairy. Spikelets 5-23mm long. Mature seed groups cylindrical to spreading. Seeds with 0 bristles. Rare SA. Vulnerable Vic.
Description and photo in G.M. Cunningham, WE Mulham, PL Milthorpe and J H Leigh (1981 and later printings) Plants of Western New South Wales pages 101-102
PlantNET description with line drawings: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Eragrostis~lacunaria
ausgrass2 description with photo and line drawings: http://ausgrass2.myspecies.info/content/eragrostis-lacunaria