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)	Australia (continental)	introduced	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Australia Australia (continental)	New South Wales	introduced invasive	National Herbarium of New South Wales (2011) "Grows in grassy areas in the Guyra, Taree and Taralga areas".
Canada Province of British Columbia	Canada (British Columbia)	introduced	Flora of North America Editorial Committee, eds. (2011)
Canada Canada	Canada (country)	introduced	Flora of North America Editorial Committee, eds. (2011) N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que,
Japan Japan	Japan (country)	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 189)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 158)
United States (west coast) United States (west coast states)	USA (Oregon)	introduced	Flora of North America Editorial Committee, eds. (2011)
United States (west coast) United States (west coast states)	USA (California)	introduced	Flora of North America Editorial Committee, eds. (2011)
United States (west coast) United States (west coast states)	USA (Washington)	introduced	Flora of North America Editorial Committee, eds. (2011)

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	Flora of North America Editorial Committee, eds. (2011)
United States (continental except west coast) United States (other states)	USA (Florida)	introduced	Flora of North America Editorial Committee, eds. (2011)

Additional information:
Fact sheet from Bayer Cropscience Crop Compendium.

Additional online information about Anthemis arvensis is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Anthemis arvensis as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Anthemis arvensis may be available from the Germplasm Resources Information Network (GRIN).

References:

Atkinson, Rachel/Sawyer, John. 2011. Naturalized species in the Juan Fernández Archipelago, Chile. Unpublished spreadsheet.

Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido. 2006. Nouveau catalogue de la flore vaculaire de l'archipel Juan Fernández (Chile) [Nuevo catálogo de la flora vacular del Archipélago Juan Fernández (Chile)]. Acta Bot. Gallica 153(4):399-587.

Flora of North America Editorial Committee, eds. 2011. Flora of North America North of Mexico (online edition).

Mito, Toshikazu/Uesugi, Tetsuro. 2004. Invasive alien species in Japan: the status quo and the new regulation for prevention of their adverse effects. Global Environmental Research 8(2)/2004: 171-191.

National Herbarium of New South Wales. 2011. PlantNet: New South Wales Flora online. The Plant Information Network System of the Botanic Gardens Trust Version 2.0. Online resource.

U.S. Dept. Agr., Agr. Res. Serv. 2011. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. 1988. Flora of New Zealand, Volume IV: Naturalised pteridophytes, gymnosperms, dicotyledons. Botany Division, DSIR, Christchurch. 1365 pp.