Narrow Thread-petal, Threadcress
Annual forb to 50cm tall. Leaves basal and scattered up the stems, to 10cm long, flat to threadlike, hairy or hairless, with lobed margins which are toothed or entire, or entire margins on the threadlike leaves. Flowers brown to green, with 4 petals, in loose clusters at the tops of the stems.
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 page 335
FloraBase photo: http://florabase.dec.wa.gov.au/browse/photo/3077