Senecio triangularis (Arrowleaf Ragwort) is a species of perennial herb in the family Asteraceae. It has a self-supporting growth form. It is native to Canada, Alaska, the contiguous United States, and western north america. Arrowleaf Ragwort has simple, broad leaves and yellow flowers. Flowers are visited by Gnophaela latipennis Boisduval 1852. Arrowleaf Ragwort is a photoautotroph.
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