Classification
Class
Magnoliopsida Brongn.
Order
Asterales Link
Family
Compositae Giseke
Genus
Senecio L.
 Nomenclature
Scientific Name:
Senecio quadridentatus Labill., Nov. Holl. Pl. 2, 48, t. 194 (1806)
Synonymy:
  • ≡ Erechtites quadridentatus (Labill.) DC., Prodr. [A. P. de Candolle] 6, 295 (1838) – as quadridentata
Vernacular Name(s):
Cotton fireweed; Pahohoraka; Pekapeka; White fireweed
 Description

Erect annual to short-lived perennial herb. Mid cauline lvs sparsely to densely white-lanate and usually green-grey on upper surface, moderately to densely white-lanate on lower surface, apetiolate, linear, entire or sometimes remotely denticulate, revolute, not amplexicaul, without lobes or with 1 narrow lobe at base, (25)–40–120–(180) × 1.5–6–(12) mm. Uppermost lvs smaller, entire. Supplementary bracts 3–5–(6), 1–1.5 mm long. Involucral bracts (8)–12–13, glabrous or sparsely lanate toward base, (5.5)–6–9 mm long. Ray florets 0. Disc yellow, c. 2 mm diam. Achenes subcylindric, narrowed to and constricted below apex, usually with 2–3 rows of hairs in narrow grooves between broad ribs, rarely almost glabrous, (2.2)–2.5–3.5 mm long.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]

 Biostatus
Indigenous (Non-endemic)
 Phenology

Flowering: Jan.–Dec.

 Bibliography
de Candolle, A.P. 1838 ("1837"): Prodromus Systematis Naturalis Regni Vegetabilis. Vol. 6. Treuttel et Würtz, Paris.
de Lange, P.J.; Rolfe, J.R.; Barkla J.W.; Courtney, S.P.; Champion, P.D.; Perrie, L.R.; Beadel, S.N.; Ford, K.A.; Breitwieser, I.; Schönberger, I.; Hindmarsh-Walls, R.; Heenan, P.B.; Ladley, K. 2018: Conservation status of New Zealand indigenous vascular plants, 2017. New Zealand Threat Classification Series. No. 22. [Not Threatened]
de Lange, P.J.; Rolfe, J.R.; Champion, P.D.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Norton, D.A.; Hitchmough, R.A. 2013: Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series 3. Department of Conservation, Wellington. [Not Threatened]
Labillardière, J.J.H. de 1806–1807: Novae Hollandiae Plantarum Specimen. Vol. 2. Huzard, Paris.