Conyza leucantha (D. Don) Ludlow & Raven, Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Conyza viscidula

Habit:  shrub

Description:  "Robust, woody shrub to 2 m high, densely glandular, stems pubescent with rusty hairs.  Leaves lanceolate, 7-10 cm long, 12-18 mm wide, margins minutely toothed, upper surface darker, both surfaces densely covered in minute yellow glandular hairs; sessile.  Inflorescence a rounded panicle; heads broad-campanulate to globose, 5-6 mm long, 5-7 mm diameter; involucral bracts rusty pubescent with paler margins.  Florets reddish; marginal florets many, filiform; inner florets ca 4.  Achenes ovoid, sparsely hairy with thickened margins; pappus of many cream to purplish fine barbellate bristles about 3 mm long" (New South Wales Flora Online).

Habitat/ecology:  In Australia, a "weed of roadsides and disturbed ground" (New South Wales Flora Online).

Propagation:  Seed

Native range:  Nepal (New South Wales Flora Online).

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	introduced invasive	Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe (1996) (p. 379) Rudérale, nombreuses localités
Philippines Philippine Islands	Philippine Islands	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)
Philippines Philippine Islands	Philippine Islands		Merrill, Elmer D. (1923) (p. 601) In old clearings, in thickets, and along trails in ope forests from sea level to 1,800 m.

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)	New South Wales	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)
Australia Australia (continental)	Queensland	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)
Cambodia Cambodia	Cambodia (Kingdom of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)
China China	China (People's Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)
Indonesia Indonesia	Indonesia (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)
Taiwan Taiwan	Taiwan Island	native	Ching-I Peng, ed. (2010) "Exposed places and roadside slopes at low elevations in the south".
Vietnam Vietnam	Vietnam (Socialist Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2010)

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

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

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

References:

Ching-I Peng, ed. 2010. Digital flora of Taiwan (online resource).

Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe. 1996. Conséquences des introductions d'espèces animales et végétales sur la biodiversité en Nouvelle-Calédonie. Rev. Ecol. (Terre Vie) 51:375-401.

Merrill, Elmer D. 1923. An enumeration of Philippine flowering plants, vol. 3 [reprint]. Bureau of Printing, Manila. 628 pp.

National Herbarium of New South Wales. 2006. Flora of New South Wales (online edition).

U.S. Dept. Agr., Agr. Res. Serv. 2010. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.