Senecio diaschides D.G.Drury

Erect herbs to c. 1.5 m high, not leafier in lower 1/3 at anthesis, with axillary growth precociously developed. Taproot well-developed; secondary roots fine. Stems very sparsely hispid or glabrous. Leaves 7–18 cm long, with l:w ratio c. 5–10, lobate to deeply lobate, with 3–8 triangular lobes per side; base with small to moderate auricles above mid-stem; margin entire or with well-spaced teeth; upper surface glabrous or nearly so; lower surface glabrous, generally not purple. Capitula numerous per stem; calycular bracteoles 3–6, 1–2 mm long; peduncle and calyculus not cobwebby at anthesis; involucre 4.5–6.5 mm long, 1–1.5 mm diam.; bracts predominantly 7–10, glabrous. Florets 12–25. Achenes narrowly obloid-ellipsoid, 2.2–2.5 mm long, brown, with papillose hairs in bands; l:w ratio of hairs c. 3. Pappus 4–5 mm long.

Grows in alluvial soils adjacent to swamps and rivers, in forest and woodland.