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Weed Seed: Ambrosia artemisiifolia (Common ragweed)

Family

Asteraceae

Common Name

Common ragweed

Regulation

Secondary Noxious, Class 3 in the Canadian Weed Seeds Order, 2016 under the Seeds Act.

Distribution

Canadian: Occurs across Canada except in NU and YT (Brouillet et al. 2016Footnote 1).

Worldwide: Native to North and South America, and widely introduced elsewhere including Europe, Africa, temperate and tropical Asia, Australasia and the Pacific Islands (USDA-ARS 2016Footnote 2). Widely distributed in North America with both native and introduced populations present in the U.S. and Canada (Brouillet et al. 2016Footnote 1, USDA-NRCS 2016Footnote 3).

Duration of life cycle

Annual

Seed or fruit type

Achene within a bur

Identification features

Size

Shape

Surface Texture

Colour

Other Features

Habitat and Crop Association

Cultivated fields, fencerows, pastures, shores, canals, quarries, railway lines, roadsides, wasteland and disturbed areas (FNA 1993+Footnote 4, Darbyshire 2003Footnote 5, CABI 2016Footnote 6). Found in a range of both agronomic and horticultural crops, particularly in cereals and cultivated row crops (Basset and Crompton 1975Footnote 7, CABI 2016Footnote 6). Often present as a dominant species in early succession of uncultivated areas (CABI 2016Footnote 6).

General Information

Seeds of common ragweed are commonly found in stored and transported grains, and have been dispersed around the world as contaminants in seed and grain crops, including cereals, oilseeds and bird seed.

A single plant typically produces 3,000 - 4000 seeds, although up to 32,000 seeds per plant have been reported. Seeds remain viable for up to 40 years (CABI 2016Footnote 6).

Similar species

Perennial ragweed (Ambrosia psilostachya)

Photos

Common ragweed (Ambrosia artemisiifolia) burs
Common ragweed (Ambrosia artemisiifolia) burs and one achene
Common ragweed (Ambrosia artemisiifolia) bur
Common ragweed (Ambrosia artemisiifolia) burs

Similar species

Similar species: Perennial ragweed (Ambrosia psilostachya) burs
Similar species: Perennial ragweed (Ambrosia psilostachya) bur
Similar species: Perennial ragweed (Ambrosia psilostachya) bur wall partially removed showing achene
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