Ionactis stenomeres

Rocky Mountain Ankle-aster

Ionactis stenomeres (A. Gray) Greene is native to dry slopes, grassy ridges, and openings at 1700–2200 m in southeastern B.C., northeastern Washington, northern and central Idaho and adjacent Montana.  Plants are 12–30 cm tall, have linear-lanceolate mid stem leaves (15–25(–30) mm long) with green margins,l and glandularfruit bodies (Nesom 2006 FNA). The species was first described as Aster stenomeres A. Gray.

Ionactis stenomeres range Semple draft
Ionactis stenomeres, 7055, Idaho
Ionactis stenomeres, leaves, 11364, Galena Summit, Idaho
Ionactis stenomeres, head, 11364, Galena Summit, Idaho
Ionactis stenomeres, 7055, Idaho
1 / 3
Ionactis stenomeres, leaves, 11364, Galena Summit, Idaho
2 / 3
Ionactis stenomeres, head, 11364, Galena Summit, Idaho
3 / 3

1-3. Ionactis stenomeris. 1. Habit, Semple & Brouillet 7055, Blaine Co., Idaho. 2-3. Leaves and flowering head, Semple & B. Semple 11364, Blaine Co., Idaho. 4. Range map.

Last updated 28 March 2025 by J.C. Semple

© 2025 J.C. Semple, including all photographs unless otherwise indicated