Senecio triangularis (Arrowleaf Ragwort) is a species of perennial herb in the family Asteraceae. They have a self-supporting growth form. They are native to Alaska, Canada, The Contiguous United States, and Western North America. They have simple, broad leaves and yellow flowers. Flowers are visited by Fuzzy-horned Bumble Bee, Syrphus torvus, Colias scudderii, and Black Tail Bumble Bee. Individuals can grow to 4 feet.
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