Purple Parsnip, Purple Trachymene
Annual forb to 25cm tall. Leaves alternating up the stems, with a sheath at the base of the leaf stalk, 1-3cm long overall, 10-30cm wide overall, flat, hairless above, slightly hairy underneath, dissected. Flowers tiny (less than 3mm across), white, blue, or purple, with 5 petals, in 2-6 flowered umbels on stalks arising from leaf-like bracts. Family Apiaceae in NSW and SA.
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 544
Florabase photos: http://florabase.dpaw.wa.gov.au/browse/photo/6268