Senecio longicollaris

Erect 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.