Smooth Fleabane - Erigeron leiomerus
State Rank Reason (see State Rank above)
Rare in Montana, where it is currently known from only a couple of alpine sites in the southwest portion of the state. Current population levels and trends are unknown. However, its high-elevation habitat is relatively inaccessible, and there are no obvious threats. Additional sites are likely to be documented if surveys were to be conducted.
Smooth Fleabane is an herbaceous perennial. Its unbranched, lax stems reach up to 15 cm high and arise from a branched rootcrown that surmounts a taproot. The basal leaves are up to 7 cm long and have a petiole and a narrowly elliptic to lance-shaped blade; those of the upper stem are smaller and narrower. Foliage is glabrous to sparsely hairy. A single flower head is borne at the top of each stem. Heads have a single series of narrowly lance-shaped, glandular involucral bracts that are 4-6 mm long. There are 15-60 white to blue rays, 6-11 mm long, and numerous yellow disk flowers, ca. 3-4 mm long. The achenes have 15-25 fine, long bristles and a few short ones, forming a pappus on top.
Flowering in July.
There are many species of Erigeron in our area; a hand lens and technical manual are needed for positive identification.
Central ID and adjacent MT, south to UT, CO, and NM. Peripheral.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Rocky soil or talus in the alpine zone.
Ecological Systems Associated with this Species
- Commonly Associated with these Ecological Systems
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Lesica, P. 1991. Noteworthy Collections in Montana....
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.