Pacific Island Ecosystems at Risk (PIER)

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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 Wall. ex DC.; Erigeron leucanthus D. Don

Habit:  shrub

Description:  "Annual herbs. Stems erect, 30-150 cm tall, branched, striate, viscid glandular pubescent, especially in inflorescence, later glabrate. Basal and lower leaves withered and deciduous at anthesis, middle cauline leaves elliptic-lanceolate, 5-10 cm long, 1-4 cm wide, apex acute to acuminate, base attenuate, nearly sessile, margins serrate, sparsely puberulous and glandular dotted on both surfaces. Heads numerous, in glomerules terminating stems and branches, 5 mm long, 6 mm across; peduncle 1-9 mm long. Involucre campanulate, bracts 3-seriate, herbaceous, margins scarious, purplish tinged, subequal, linear-lanceolate, 3-4 mm long, densely glandular puberulous and with few eglandular hairs. Ray florets numerous, corolla tubular, filiform, 0.5-1 mm long, lacerate apically; styles 3-3.5 mm long, prominent, nearly equaling pappus, upper part red-purple. Disc florets 5-10, corolla funnelform, ca. 6 mm long, upper part slightly shorter than lower, minutely pubescent just below apex, 5-lobed; lobes and styles sometimes red-purple. Achenes obovate, compressed, 0.5-0.6 mm long, 0.3-0.4 mm wide, sparsely pubescent, glabrate, pale umber. Pappus slightly reddish, bristles numerous, in one row, 4-6 mm long at maturity, deciduous"  (Digital Flora of Taiwan).

"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).  In Taiwan, "exposed places and roadside slopes at low elevations in the south"  (Digital Flora of Taiwan).

Propagation:  Seed

Native range:  "India, Thailand, southern China, Taiwan, the Ryukyus, the Philippines, Java and Australia"  (Digital Flora of Taiwan).

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. (2013)
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. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Cambodia
Cambodia
Cambodia (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Fujian, Guangdong, Guangxi, Guizhou, Yunnan
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Java
Japan
Ryukyu Islands
Ryukyu Islands native
Ching-I Peng, ed. (2013)
Taiwan
Taiwan Island
Taiwan Island native
Ching-I Peng, ed. (2013)
"Exposed places and roadside slopes at low elevations in the south".
Thailand
Thailand
Thailand (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam
Vietnam
Vietnam (Socialist Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


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This page was created on 23 APR 2005 and was last updated on 13 MAR 2012.