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 Western North America, Canada, Alaska, and The Contiguous United States. They have simple, simple leaves and yellow flowers. Flowers are visited by Silvery Checkerspot, Vanessa cardui, Limenitis weidemeyerii, and Boloria chariclea. Individuals can grow to 4 feet.
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