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Montana Field Guide

Montana Field Guides

Parry's Fleabane - Erigeron parryi

Species of Concern

Global Rank: G2G3
State Rank: S2S3
* (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)
Though the species is restricted to southwest Montana, it is locally common at many of the sites it occupies. Additionally, threats to the species appear to be low as a result of the rocky, sparsely vegetated habitat it prefers.
  • Details on Status Ranking and Review
    Parry's Fleabane (Erigeron parryi) Conservation Status Review
    Review Date = 05/03/2013
    View State Conservation Rank Criteria
    Population Size

    Score1 - Moderate: Generally 10,000-100,000 individuals.

    Range Extent

    Score3 - Local Endemic or Very Small Montana Range: Generally restricted to an area <10,000 sq. miles (equivalent to the combined area of Phillips and Valley Counties) or <6 Sub-basins (4th code watersheds) Range-wide OR limited to one Sub-basin in Montana

    Area of Occupancy

    Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).

    Trends

    ScoreNA - Rank factor not assessed.

    CommentTrends unknown though populations are likely stable or experiencing only minor declines.

    Threats

    Score0-1 - Low to Medium.

    Intrinsic Vulnerability

    Score0-1 - Low to Moderate Vulnerability.

    Raw Conservation Status Score

    Score 7 to 9 total points scored out of a possible 16 (Rarity factors and threats only).

 
General Description
Taprooted perennial with a simple or branched caudex. Stems erect, 2–15 cm. Herbage hirsute with ascending to spreading hairs. Leaves basal and cauline, linear, entire, 1–6 cm long. Heads 1 to 3, radiate. Involucres hemispheric, 4–9 mm high; phyllaries in 1 or 2 series, densely hirsute with white-septate hairs, minutely glandular. Rays 20 to 40, white, usually erect; ligules 5–8 mm long. Disk corollas 2–4 mm long. Achenes ca. 2 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Phenology
Flowering occurs in June and early July.

Diagnostic Characteristics
Erigeron radicatus has smaller heads and disk flowers. Erigeron ochroleucus has appressed hair on the stems, and sparsely hariy leaves; old leaf bases are generally not apparent on the caudex. Spreading hairs on the stems of E. pumilus are about 1 mm long.

Erigeron parryi was first described over 100 years ago based on a single collection made by Frank Tweedy along Grasshopper Creek in Beaverhead County, Montana. Over 50 years ago Arthur Cronquist recognized E. parryi in his monograph on the genus Erigeron (Cronquist 1947). He stated that the species was similar to E. ochroleucus, but the hair of leaves and stems was strikingly different. He hinted that E. parryi might be better considered a variety of E. ochroleucus, but since there was still only one collection, he did not formally propose a new nomenclatural combination. Eight years later Cronquist merged E. parryi into E. ochroleucus, stating that it was a rare form with spreading-hairy herbage (Cronquist 1955). Since that time several additional populations of E. parryi have been located in southwest Montana.

Species Range
Present
 


Range Comments
Endemic to southwest Montana.

Summary of Observations Submitted for Montana
Number of Observations: 27

(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
Erigeron parryi occurs on skeletal, limestone-derived soils of ridge crests, slopes and outcrops at 4,500-7,000 feet. Associated vegetation is sparse and dominated by cushion plants, other low forbs and bluebunch wheatgrass. Dominant vegetation in nearby areas with more developed soils is sagebrush steppe or juniper woodland.

Ecological Systems Associated with this Species

Ecology
Erigeron parryi is a small plant that occupies habitats with sparse vegetation, suggesting that it is not tolerant of competition.

Management
At least two populations of Parry's fleabane occur in historic mining districts (Grasshopper Creek, Silver Star). Road construction and other mining-related activities could pose future threats. All known populations are subject to livestock grazing; however, it is unlikely that these small forbs are palatable, and the sparsely vegetated habitat is probably not frequented by livestock.

References
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Citation for data on this website:
Parry's Fleabane — Erigeron parryi.  Montana Field Guide.  .  Retrieved on , from