Annual forb to 50cm tall. Leaves alternating up the stems, often somewhat stem clasping, 4-12 cm long, 5-20mm wide, hairy to hairless, deeply lobed to dissected, the lobes toothed. Flowers yellow, with 8-20 'petals'. Flower heads broadly bell-shaped, in clusters of 1-20 flower heads at the tops of the stems. Rare Vic.
The description above is mostly based on Thompson, I.R., (2004) Taxonomic studies of Australian Senecio (Asteraceae): 3. Radiate arid region species allied to S. magnificus and the radiate, alpine species S. pectinatus. Muelleria 20: 126, 128. Fig 1 (page 114) Fig 7 (map)
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 677
PlantNET description with line drawings and photo of dried specimen: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Senecio~platylepis