Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: cotton fireweed

Habit:  herb

Description:  "Perennial herb up to ca 60 cm tall. Leaves sessile, linear or linear-ovate, apex acuminate, base attenuate and sometimes auriculate, margin usually revolute, entire or denticulate, occasionally coarsely toothed, 3-13 cm x 0.2-0.5 (-3) cm, with soft matted hairs at least below, sometimes glabrous or scabrous above. Heads in cymose corymbs; involucres more or less cylindrical, ca 3 mm broad in flower, involucral bracts 11-13, 6-8 mm long; ray florets absent. Achenes ca 3 mm long, ridges hairy; pappus 5-6 mm long" (Stanley and Ross, 1986; vol. 2, p. 576).

Habitat/ecology:  "Grows in disturbed situations, especially after fire" (New South Wales Flora Online). In New Zealand, "waste places, riverbeds and other stony places, cliffs and rock outcrops, also occasional in shrubland and grassland, sea level to 1000 m" (Webb et al., 1988; p. 284).

Propagation:  Seed

Native range:  Australia (GRIN).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 96)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia Australia (continental)	Australia (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 284)

Additional information:
Additional online information about Senecio quadridentatus is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Senecio quadridentatus as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Senecio quadridentatus may be available from the Germplasm Resources Information Network (GRIN).

References:

Stanley, T. D./Ross, E. M. 1989. Flora of south-eastern Queensland. Queensland Department of Primary Industries, Misc. Pub. 81020. 3 Volumes.

Swarbrick, John T. 1997. Weeds of the Pacific Islands. Technical paper no. 209. South Pacific Commission, Noumea, New Caledonia. 124 pp.

U.S. Dept. Agr., Agr. Res. Serv. 2011. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. 1988. Flora of New Zealand, Volume IV: Naturalised pteridophytes, gymnosperms, dicotyledons. Botany Division, DSIR, Christchurch. 1365 pp.