Erigeron bonariensis

Greyish-green or purplish-green annual to 1 m high; stem often unbranched below inflorescence, striate, somewhat appressed hairy under longer, stiffly spreading hairs. Lower leaves elliptic to narrow oblanceolate, c. 4–12 cm long, 5–15(–20) mm wide, hispid to rather appressed hirsute or finely strigose, often with longer spreading hairs, distantly and shallowly serrate or with lobes to c. 10 mm long; upper leaves narrow oblanceolate or often linear, c. 2–8 cm long, 2–6 mm wide, finely hispid to strigose, usually entire. Capitula numerous; panicle pyramidal or broadly corymbiform with lateral branches often exceeding the central axis; involucres campanulate, 5–6 mm long; bracts strigose to finely hispid, often purplish, the innermost pale on the lower part of the inner face (except for the darker midrib) at maturity; receptacles 2–4(–5) mm diam., more or less smooth to slightly rough (rarely quite roughened). Outer florets whitish or tinged purplish, with minute oblique limb. Cypselas narrow-oblong to elliptic, to 1.6(–2) mm long, c. 0.4 mm wide; pappus bristles white to pale pinkish, c. 3–4 mm long. Flowering mostly spring–autumn.