- 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.