Agoseris retrorsa is a species of flowering plant in the daisy family known by the common name spearleaf agoseris.
Agoseris retrorsa is a perennial herb forming a base of leaves about a number of erect, thick, wool-coated inflorescences up to half a meter in height. The narrow leaves are linear to lance-shaped, and spearlike with curving toothlike lobes along the edges.
The inflorescence bears a single flower head which is several centimeters wide when fully open. It is lined with woolly, pointed phyllaries which are green, often with reddish purple longitudinal streaks or stripes. The flower head contains many golden yellow ray florets, the outer ones usually darker in color.
- Jepson Manual Treatment: Agoseris retrorsa
- USDA Plants Profile: Agoseris retrorsa
- Flora of North America
- Agoseris retrorsa — U.C. Photo gallery
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