Annual forb to 30cm tall, or prostrate. Leaves opposite each other to alternating up the stems, 0.4-1.5cm long, less than 1mm wide, linear, cobwebby to woolly, with margins curved down and pointed tips. Flowers white, woolly, with 0 petals. Flower heads oval, numerous in dense leafy clusters at the ends of the stems, or the stalks arising from the bases of the leaves.
Description and photo (as Helipterum uniflorum) in G.M. Cunningham, WE Mulham, PL Milthorpe and J H Leigh (1981 and later printings) Plants of Western New South Wales page 690
PlantNET description with line drawings: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Rhodanthe~uniflora