Ionactis stenomeres, the Rocky Mountain aster, is a rare North American species in the family Asteraceae. It occurs in the Province of British Columbia in western Canada and also in the northwestern United States (Washington, Idaho, Montana).Biota of North America Program 2014 county distribution map
Description Ionactis stenomeres is a small perennial up to tall, with a woody underground caudex. The plant usually produces only one flower head, each with 7-21 blue or lavender ray flowers surrounding yellow disc flowers.Flora of North America, Ionactis stenomeres (A. Gray) Greene, 1897. Rocky Mountain ankle-aster Montana Field Guides, Rocky Mountain Aster - Ionactis stenomeres with photos
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