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Weed Seed: Senecio madagascariensis (Madagascar ragwort)

Family

Asteraceae

Common Name

Madagascar ragwort

Regulation

Distribution

Canadian: Absent from Canada (Brouillet et al. 2016Footnote 1).

Worldwide: Native to southern Africa and Madagascar and introduced to Argentina, Australia, Colombia, Japan, Kenya, Mauritius, Réunion and the United States (Hawaii) (CFIA 2014Footnote 2).

Duration of life cycle

Short-lived perennial

Seed or fruit type

Achene

Identification features

Size

Shape

Surface Texture

Colour

Other Features

Habitat and Crop Association

Colonizes a wide range of habitats, elevations and soil types. Often found in arid or moist pastures, coastal plains, yards, fields and roadsides (CFIA 2012Footnote 3).

General Information

Madagascar ragwort is a serious pest plant in Australia and Hawaii (Starr et al. 1999Footnote 4). This pioneer plant produces several thousands of seeds every year that are dispersed by wind or water (Starr et al. 1999Footnote 4). Infested pastures suffer lowered productivity through competition and toxicity to livestock (CABI 2016Footnote 5).

Similar species

Common groundsel (Senecio vulgaris)

South African ragwort (Senecio inaequidens)

Photos

Figure 1 - Madagascar ragwort (Senecio madagascariensis) achenes
Madagascar ragwort (Senecio madagascariensis) achenes
Figure 2 - Madagascar ragwort (Senecio madagascariensis) achene
Madagascar ragwort (Senecio madagascariensis) achene
Figure 3 - Madagascar ragwort (Senecio madagascariensis) achene, close-up of surface
Madagascar ragwort (Senecio madagascariensis) achene, close-up of surface
Figure 4 - Madagascar ragwort (Senecio madagascariensis) achene, top view
Madagascar ragwort (Senecio madagascariensis) achene, top view

Similar species

Figure 5 - Similar species: Common groundsel (Senecio vulgaris) achenes
Similar species: Common groundsel (Senecio vulgaris) achenes
Figure 6 - Similar species: Common groundsel (Senecio vulgaris) achene, close-up of surface
Similar species: Common groundsel (Senecio vulgaris) achene, close-up of surface
Figure 7 - Similar species: South African ragwort (Senecio inaequidens) achenes
Similar species: South African ragwort (Senecio inaequidens) achenes
Figure 8 - Similar species: South African ragwort (Senecio inaequidens) achene, close-up of surface
Similar species: South African ragwort (Senecio inaequidens) achene, close-up of surface
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