- = Senecio cahillii Belcher, Muelleria 5: 120-122 (1983)
Erect, annual or short-lived perennial herb, up to c. 1.5 m tall. Stems glabrous, branched above to form infl. Lower and mid cauline lvs glabrous, apetiolate, not lobed and remotely dentate to shallowly 1-pinnatisect, linear to lanceolate, acute, cuneate and often amplexicaul and deeply 1–3-fid at base, (4)–6–15–(20) × 0.3–2–(3.5) cm; venation pinnate. Uppermost cauline lvs smaller, entire or remotely dentate, often not amplexicaul. Capitula in loose panicles. Supplementary bracts 4–6, lanceolate, 1–2 mm long. Involucral bracts 8–12, linear, glabrous, 4.5–5.5 mm long. Ray florets 0. Disc yellow, 1–2 mm diam. Achenes subcylindric, only slightly narrowed to and constricted below apex, with 2–(3) rows of hairs in narrow grooves between broad ribs, 1.5–2.8 mm long; pappus 4–6 mm long.
[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]
Flowering: Nov.–Apr.