Pacific Island Ecosystems at Risk (PIER)

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Cotula australis
(Sieber ex Spreng.) Hook.f., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Anacyclus australis Sieber ex Spreng.

Common name(s): [more details]

English: annual-buttonweed, Australian brass buttons, bachelor's button, carrotweed, common cotula, soldier's-button

Habit:  herb

Description:  "Delicate annual herbs 0.3-2 dm tall; stems branched from base, sparsely pubescent with spreading hairs.  Leaves 1-3 cm long, 1-2 times pinnately lobed, the lobes linear.  Heads ca. 5-7 mm in diameter; involucral bracts ca. 2 mm long, margins scarious; marginal florets without corollas, on long pedicels, inner florets with corollas, these functionally staminate, yellow, on short pedicels.  Outer achenes ca. 1.5 mm long, strongly compressed and with a whitish wing, the inner ones ca. 1.75 mm long, not winged"  (Wagner et al., 1999; pp. 289, 1859).

Habitat/ecology:  In Hawai‘i, "sparingly naturalized in relatively dry areas" (Wagner et al., 1999; pp. 289, 1859).

Propagation:  Seed

Native range:  Australia (Wagner et al., 1999; p. 289). Canary Islands, Australia, New Zealand, United Kingdom, France (including Corsica); naturalized elsewhere (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia (Pacific offshore islands)
Lord Howe Island
Lord Howe Island possibly native
Orchard, Anthony E., ed. (1994) (p. 18)
"Found in lowland areas, particularly where there is open soil". Vouchers cited: M.M.J. van Balgooy 1025 (K, NSW), P.S. Green 1613 (A), J. Pickard 2772 (NSW)
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island probably native
Orchard, Anthony E., ed. (1994) (p. 8)
"Found in lowland areas, particularly where there is open soil". Vouchers cited: P. Ralston 57 (A), P.S. Green 1436 (A), W. Laing (CHR)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
invasive
Skottsberg, Carl (1953) (p. 225)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 460, 464, 552)
Chile (offshore islands)
Juan Fernández Islands
Isla Más Afuera (Alejandro Selkirk Island) introduced
invasive
Skottsberg, Carl (1953) (p. 225)
Chile (offshore islands)
Juan Fernández Islands
Isla Más Afuera (Alejandro Selkirk Island) introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Más Afuera (Alejandro Selkirk Island) introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 460, 464, 552)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 460, 464, 552)
Voucher cited: Danton I(5/343)1686
Chile (offshore islands)
Juan Fernández Islands
Morro El Verdugo introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 460, 464, 552)
Chile (offshore islands)
Juan Fernández Islands
Morro Juanango introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 460, 464, 552)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 289)
Voucher cited: Fagerlund & Mitchell 517 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Lorence, David H./Flynn, Timothy W./Wagner, Warren L. (1995) (p. 23)
Vouchers cited: T. Flynn & L. Mehrhoff 4441 (BISH, PTBG, US), D. Lorence & M. Lorence 6732 (F, MO, PTBG)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Oppenheimer, Hank (2011) (p. 6)
Voucher cited: Oppenheimer H40920 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 289)
East Maui
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Oppenheimer, Hank L. (2003) (p. 6)
West Maui. Oppenheimer H110039 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 289)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
invasive
Tassin, Jacques (2005)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
MacKee, H. S. (1994) (p. 34)
Voucher cited: Däniker 40 (Z)
New Caledonia
New Caledonia Archipelago
Île des Pins (Isle of Pines) introduced
invasive
Tassin, Jacques (2005)
New Caledonia
New Caledonia Archipelago
Île des Pins (Isle of Pines) introduced
MacKee, H. S. (1994) (p. 34)
Vouchers cited: Deplanche 226, Pancher 468, Montrouzier s.n.
New Zealand (offshore islands)
Kermadec Islands
Kermadec Islands native
Allan, H. H. (1982) (p. 168)
"More or less common in lowland waste places".
New Zealand (offshore islands)
Kermadec Islands
Raoul Island native
Sykes, W. R. (1977) (p. 87)
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. (2013)
South Australia, Tasmania, Victoria, Western Australia
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)
Chile (continental)
Chile
Chile (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 190)
Mexico
Mexico
Mexico (United Mexican States) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Baja Norte, Federal District, Jalisco, Michoacan, Queretaro
Naturalized
New Zealand
New Zealand
New Zealand (country) probably introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 168)
"More or less common in lowland waste places".
New Zealand
New Zealand
New Zealand (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
United States (west coast)
United States (west coast states)
USA (Oregon) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
United States (west coast)
United States (west coast states)
USA (California) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Arizona, Maine, Texas
Naturalized
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized


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This page was created on 3 AUG 2002 and was last updated on 16 MAR 2013.