Madagascar ragwort
Senecio madagascariensis Poir.


Senecio madagascariensis is an annual or biennial herb that can grow up to 23.6 in. (60 cm) tall.
Leaves are alternate, up to 4.7 in. (12 cm) long, and bright green. Cauline leaves are linear to lanceolate with an acute apex, denticulate margins, and can be petiolate, subsessile, or sessile.
The small flower heads are 0.5-1 in. (12-25 mm) in diameter. Involucral bracts are acute, glabrous, and 0.16-0.24 (4-6 mm) long. Outer bracts are lanceolate, acute, purple tinged, and 0.04-0.08 (1-2 mm) long. Ray florets are yellow and 0.3-0.6 in. (8-14 mm) long. Disk florets are perfect and yellow as well.
Fruits are 0.06-0.09 in. (1.4-2.2 mm) long, 9 to 10 ribbed, and pubescent between ribs. Seeds are white and 2 to 3 times as long as the fruit.
Ecological Threat
Senecio madagascariensis can be found in a wide variety of habitats but prefers fertile, well-drained, disturbed soils. It is considered native to southern Africa and Madagascar.

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State Regulated List

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Asterales
Family: Asteraceae
Genus: Senecio
Subject: Senecio madagascariensis Poir.

Synonyms and Other Names

Other Common Names:
fireweed, Madagascar groundsel


Plants - Forbs/Herbs