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 Gnophaela latipennis, Botanophila, Lasionycta impingens, and Polygonia zephyrus. Individuals can grow to 4 feet.
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