Lava Aster - Ionactis alpina
(see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Numerous collections from a large number of counties in western Montana. This plants high elevation habitat is probably currently secure. Regionally endemic.
Perennial from a branched caudex. Stems sterile and fertile, erect, 4–15 cm. Herbage scabrous with pubescent to tomentose stems. Leaves cauline sessile, lanceolate to oblanceolate, entire, 3–12 mm long. Inflorescence a solitary head; peduncles villous. Involucre turbinate, 7–11 mm high; phyllaries linear, villous, glandular, keeled, scarious-margined. Rays 7 to 21, blue; ligules 6–15 mm long. Disk flowers yellow; corolla 5–7 mm long. Pappus in 2 series. Achenes linear-obovoid, 5–6 mm long, sericeous (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)