(Nutt.) Greene 1897
Ionactis alpina (formerly Aster scopulorum; common name Lava Ankle-aster) is a species of aster known by the common name lava aster. It is native to western United States from California to Montana, where it grows in dry areas.
Ionactis alpina is a perennial herb growing from a caudex and fibrous root system. It produces a short, mostly erect, hairy stem up to 12 centimeters (4.8 inches) in height. Most of the small leaves are on the lower part of the stem. They are up to about a centimeter (0.4 inches) long, oval to lance-shaped and pointed, somewhat stiff and coated in hairs. 
The inflorescence bears solitary flower heads with purple-green phyllaries, 7–21 thin blue, purple, or occasionally white ray florets surrounding 19–50 long yellow disc florets. The fruit is a hairy achene.
- Jepson Manual Treatment - Ionactis alpina
- United States Department of Agriculture Plants Profile; Ionactis alpina
- Ionactis alpina in the CalPhotos Photo Database, University of California, Berkeley
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