Senecio have alternate and often basal leaves, either hairy or hairless. Flowerheads are yellow and have few ray florets with spaces between them. Flowerheads have involucral bracts in one equal row. Fruits have hairy tufts.
Guide to Identify Presented Species of Genus Senecio
UPPER LEAVES WELL DEVELOPED, NOT REDUCED
S. triangularis – Arrow-leaved Groundsel Stems stout, erect, unbranched, leafy, 30-150 cm tall. Moist places, mountains.
Flowerheads in a short cluster, with about 8 yellow rays 7-13 mm long.
Leaves alternate, elongate-triangular, stalked, sharp-toothed, nearly hairless.
