Anthemis arvensis L., Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: corn chamomile, field chamomile, mayweed, scentless chamomile

French: anthémis des champs, fausse camomille

Spanish: manzanilla silvestre

Habit:  herb

Description:  "Annuals (sometimes persisting), (5-) 10-30+ [-80] cm, not notably scented. Stems green or reddish, decumbent (sometimes rooting at nodes) or ascending to erect, branched mostly proximally, ± strigoso-sericeous or villous, glabrescent. Leaf blades 15-35 x 8-16 mm, 1-2-pinnately lobed (ultimate lobes triangular to narrowly elliptic or linear). Peduncles mostly 4-15 cm (sometimes clavate in fruit). Involucres 6-13 mm in diameter, ± villous. Receptacles paleate throughout; paleae lanceolate to oblanceolate, weakly navicular (± carinate), 3-4+ mm (including acuminate-spinose tips). Ray florets 5-20, pistillate, fertile; corollas white, rarely tinged with pink, laminae 5-15 mm. Disc corollas (sometimes tinged with purple) 2-3(-4) mm. Cypselae 1.7-2+ mm, ribs smooth or weakly tuberculate (sometimes separated by relatively deep furrows); pappi 0 or coroniform (0.01+ mm)"  (Flora of North America online).

Description from Flora of New Zealand.

Habitat/ecology:  In North America, "disturbed sites, abandoned plantings; 10-400+ m"  (Flora of North America online).  In New Zealand, "casual or local in waste places, pasture and ballast"  (Webb et al., 1988; p. 158).

Propagation:  Seed

Native range:  Canary Islands, northern Africa, western Asia (GRIN).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
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 cultivated	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 551)

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	introduced invasive	National Herbarium of New South Wales (2013) "Grows in grassy areas in the Guyra, Taree and Taralga areas".
Australia Australia (continental)	Australia (continental)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
British Columbia (province of Canada) Province of British Columbia	Canada (British Columbia)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
Japan Japan	Japan	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 189)
Japan Ryukyu Islands	Ryukyu Islands	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 158)
South America (Pacific rim) South America (Pacific rim)	Chile (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
United States (west coast) United States (west coast states)	USA (Washington)	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
Canada Canada	Canada	introduced	Flora of North America Editorial Committee, eds. (2013) N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que,
United States (continental except west coast) United States (other states)	United States (other states)	introduced	Flora of North America Editorial Committee, eds. (2013)
United States (continental except west coast) United States (other states)	USA (Florida)	introduced	Flora of North America Editorial Committee, eds. (2013)

Control:  If you know of control methods for Anthemis arvensis, please let us know.