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Montana Field Guide

Montana Field Guides

Evermann Fleabane - Erigeron evermannii

Species of Concern

Global Rank: G4
State Rank: S2?
* (see State Rank Reason below)

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
MNPS Threat Rank:
C-value:

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is currently known from two alpine peaks in the Bitterroot Mountains. Available data are based on specimen collections from the 1960's and 1970's, though there is no reason to believe that these populations no longer exist or that they have been negatively impacted. More current data are needed.
 
General Description
Evermann Fleabane is a dwarf perennial. Its stems reach up to 10 cm high and arise from a branched rootstock and from a long, deep-seated taproot. The glabrous basal leaves are up to 4 cm long, spoon-shaped, and rounded at the tips. The stem leaves are greatly reduced or lacking. The flowering heads are solitary at the ends of the stems. The rays that compose the petals of the flowering head are 6-10 mm long and white or occasionally light blue. The involucral bracts are 5-8 mm long, spreading hairy, and usually glandular. The achenes have 25-35 unequal-length bristles, forming a pappus, at the top.

Phenology
Flowering in July-August.

Diagnostic Characteristics
Erigeron is a large and difficult genus to distinguish. The tap-rooted habit, triple-nerved basal leaves, stem pubescence, almost complete absence of stem leaves, and the shifting talus habitat are good distinguishing characters for E. evermannii.

Species Range
Present
 


Range Comments
Central ID to southwest MT. Regional endemic.

Summary of Observations Submitted for Montana
Number of Observations: 6

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Shifting talus slopes and dry, rocky meadows near or above timberline.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Evermann Fleabane — Erigeron evermannii.  Montana Field Guide.  .  Retrieved on , from