Senecio madagascariensis

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Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Genus: Senecio
Species: S. madagascariensis
Scientific Name
Senecio madagascariensis
Poir.
Common Names

Madagascar ragwort, fireweed, Madagascar groundsel

Overview

Appearance
Senecio madagascariensis is an annual or biennial herb that can grow up to 23.6 in. (60 cm) tall.
Foliage
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.
Flowers
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.
Fruit
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.

Resources

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