Senecio longicollaris
Riverina FireweedErect annual herb to 1.8m high; stem glabrous or sparsely appressed-cottony. Leaves pseudopetiolate or sessile, very narrow-elliptic, denticulate; upper surface sparsely appressed-cottony; lower surface sparsely to moderately coarse-hairy, with hairs short, sometimes only cobwebby; mid-stem leaves auriculate of attenuate at base, 8–24 cm long, to 2.5 cm wide; upper leaves cuneate at base. Inflorescence corymbose, typically with 30–100 capitula; capitula non-radiate; involucre cylindric, 7.0–9.0 mm long, cobwebby or sometimes glabrescent; bracts mostly 12–14; bracteoles present; florets 30–50, bisexual and female. Cypselas lageniform, usually extremely attenuate apically, 4.0–6.0 mm long, brown, papillose-hairy scattered in lines; pappus of slender hairs 6–7 mm long, deciduous. Flowers all year, mostly summer–autumn.
LoM, Wim, GleP, VVP, VRiv, MuF, GipP, HNF. Grows on floodplains and by water in forest, woodland and shrubland mainly in the north of the state with scattered occurrences in the south at Portland, Beaumaris and Sandringham.
