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Montana Field Guide

Montana Field Guides

Slender Fleabane - Erigeron tener

Species of Concern

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

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 3
C-value:

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is currently known from a single locality in the southwest corner of the state. Current population levels and trends are unknown.
 
General Description
Slender Fleabane is a perennial with 1-few stems that are 3-15 cm tall, arising from a taproot and woody rootcrown. Foliage is covered by short hairs. The basal leaves have a pointed leaf blade 7-25 mm long tapering at the base to the leaf stalk. Stem leaves are linear and few. The daisy-like, flowering heads are 1-3 on the stem. Involucral bracts are 3.5 mm long, finely glandular, and usually with short, spreading hairs. The 15-40 rays are blue or sometimes purple, 4-8 mm long and 1-1.7 mm wide. The achenes have 15-30 inner bristles about as long as the disk corollas, and outer bristles are obscure or wanting.

Phenology
Flowering in late July - early August.

Diagnostic Characteristics
A combination of the woody rootcrown, single-veined basal leaves, reduced stem leaves, absence of spreading stem hairs, blue rays, and leaf shape distinguish it from most western Erigeron in our area including E. tweedyi and E. cespitosus. A hand lens or microscope and technical key are needed for positive identification.

Species Range
Present
 


Range Comments
Beaverhead County. OR to MT south to CA, AZ and WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 1

(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
Open limestone slopes in the upper montane zone.

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