About Senecio serra Hook.
Senecio serra Hook. is a species of flowering plant in the aster family, with the common names tall ragwort and sawtooth groundsel. It is native to the western United States, and grows in several types of habitat including sagebrush and woodlands. This perennial herb grows one or a cluster of erect stems from a branched, woody caudex. The plant can grow taller than two meters. Most of the plant has a hairless texture, though young plants may sometimes look fuzzy, and ranges in color from green to red-tinged. Its leaves have lance-shaped blades that reach up to 20 centimeters long, grow on short petioles, and are distributed evenly along the stems. Its inflorescence is a spreading arrangement of many flower heads, each lined with phyllaries that have green or black tips. Each flower head contains yellow disc florets, plus 5 to 8 yellow ray florets that are each under one centimeter long.
