Pacific Island Ecosystems at Risk (PIER)

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Adenostemma platyphyllum
Cass., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chamorro: bulak-manuk, chaguan-chiba, chaguan-manuk

English: adenostemma, clubwort

Spanish: mama Juana, tía Juana

Habit:  herb

Description:  "Coarse, erect annual to about 1 m tall, the stem subglabrous to evidently hirsute-puberulent, at least above, with loose or spreading, multicellular hairs; leaves relatively large and soft, glabrous or inconspicuously hairy, largest ones (commonly borne near or above middle of plant) with ovate or elliptic to more often (at least on vigorous plants) deltoid to subcordate or subhastate blade 5-15 cm long, 3-15 cm wide, with evidently toothed to subentire margins, on a more or less evident, often broadly winged petiole; uppermost leaves sometimes alternate; inflorescence openly branched and nearly naked, with more or less numerous, rather small heads on slender peduncles mostly 1-2 cm long; involucre 3-5 mm high, its bracts herbaceous, not much if at all imbricate, rough-puberulent and often somewhat glandular (as also the peduncles), oblong or oblong-spatulate, broadly rounded distally, tending to be connate toward base; disk 508 mm wide; styles white like the hairy or glandular-hairy corolla; achenes short-clavate, densely stipitate-glandular or glandular-warty, about 2.5 mm long; pappus members 0.5-1 mm long, obviously thickened above middle"  (Wiggins & Porter, 1971; pp. 309-310).

Habitat/ecology:  In New Guinea, "a plant of wet situations; streamsides, ditches, old gardens, sometimes troublesome in badly-drained pasture. From low altitudes to 2000 m" (Henty & Pritchard, 1975; p. 62). In Tonga, "occasional... as a waste-area weed" (Yuncker, 1959; p. 266). Moist uplands in the Galápagos Islands (McMullen, 1999; p. 247). On Guam, "along shady water-courses in the southern part of the islands" (Stone, 1970; pp. 579-580).

Propagation:  Sticky awns atop achenes cling to clothing and the fur of animals (McMullen, 1999; p. 247).

Native range:  A pantropical weed (Wiggins & Porter, 1971; pp. 309-310).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Ecuador (Galápagos Islands)
Isabela Group
Isabela Island introduced
invasive
cultivated
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Sierra Negra, Isabela Island introduced
invasive
cultivated
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Pinta Group
Pinta Island introduced
invasive
cultivated
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
San Cristóbal Group
San Cristóbal Island introduced
invasive
cultivated
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz Island introduced
invasive
cultivated
Charles Darwin Foundation (2008)
French Polynesia
Society Islands
Raiatea (Havai) Island   Welsh, S. L. (1998) (pp. 68-69)
Vouchers cited: Fosberg & Sachet 63321, Moore 398, BRY 26485
French Polynesia
Society Islands
Tahiti Island   Welsh, S. L. (1998) (pp. 68-69)
Guam
Guam Island
Guam Island probably native
Stone, Benjamin C. (1970) (pp. 579-580)
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) invasive
Henty, E. E./Pritchard, G. H. (1975) (p. 62)
From low altitudes to 2000 m.
Tonga
Tongatapu Group
Tongatapu Island introduced
invasive
Yuncker, T. G. (1959) (p. 266)
Cited: Moseley.
Tonga
Vava‘u Group
Vava‘u Island introduced
invasive
Yuncker, T. G. (1959) (p. 266)
Cited: Crosby.
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Colombia
Colombia
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 20 JUN 2004 and was last updated on 5 NOV 2011.