Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: button Onehunga weed, dwarf jojo

Habit:  herb

Description:  "Prostrate annual, forming patches up to ca 20 cm diameter.  Stems sparsely to moderately clothed in long hairs.  Basal and lower cauline leaves petiolate, sheathing at base, moderately hairy, 2-3-pinnatisect, up to ca 12 x 3 cm; primary divisions in 4-8 pairs; ultimate segments narrow-elliptic to subulate, all in one plane.  Cauline leaves similar to basal, but usually smaller.  Involucral bracts in 1-2 rows, hairy, obtuse to apiculate, 3-5 mm long.  Capitula inconspicuous at flowering, clustered near base of plant and separated by short obscured internodes, 5-12 mm diameter at fruiting, with 30-numerous mature achenes.  Achenes 3-4.5 x 1-1.5 mm (including spine), sometimes with short hairs on both surfaces but not on wings, with long erect hairs at apex giving a woolly appearance to the fruiting capitulum; lateral angles entire, with narrow thick wings horizontally ridged in lower 2/3, rounded or squared to apex; spine 1-2 mm long"  (Webb et al., 1988; pp. 172-173).

Habitat/ecology:  In New Zealand, "mostly waste places, also pastures" (Webb et al., 1988; pp. 172-173).

Propagation:  Seed

Native range:  Argentina, Brazil, Paraguay, Uruguay (Webb et al., 1988; pp. 172-173).

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) San Cristóbal Group	San Cristóbal Island	native	Charles Darwin Research Station (2005)
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	native	Charles Darwin Research Station (2005)
Japan (offshore islands) Ogasawara (Bonin) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007)
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 97)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	Tassin, Jacques (2005)

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)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 344)
China China	Hong Kong	introduced invasive	Wu, Te-lin (2001) (p. 287) In wasteland.
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 190)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 172) "Mostly waste places, also pastures".
Taiwan Taiwan Island	Taiwan Island		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 344)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 344)

Control:  If you know of control methods for Soliva anthemifolia, please let us know.