Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Entire-leaved Avens - Dryas integrifolia

Species of Concern

Global Rank: G5
State Rank: S2S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 4
C-value:

External Links






State Rank Reason (see State Rank above)
Known in Montana from the Big Snowy Mountains and possibly from the Tobacco Root Mountains, though location of this latter specimen collection is unknown and cannot be confirmed. Current population levels and trends are unknown. However, its high-elevation habitat is relatively inaccessible, and there does not appear to be any significant threats.
  • Details on Status Ranking and Review
    Entire-leaved Avens (Dryas integrifolia) Conservation Status Review
    Review Date = 06/06/2012
    View State Conservation Rank Criteria
    Population Size

    Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.

    Range Extent

    Score1 - Peripheral, Disjunct or Sporadic Distribution in MT: Widespread species that is peripheral, disjunct or sporadically distributed within MT such that it occurs in <5% of the state (<7,500 sq. miles or the combined area of Beaverhead and Ravalli Counties) or is restricted to 4-5 sub-basins.

    Area of Occupancy

    Score3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1-2 - Moderate to High.

    Trends

    Score0-1 - Stable to Minor Declines:

    CommentPopulation trends are unknown, though habitat appears to be stable.

    Threats

    Score0-1 - Low to Medium.

    Intrinsic Vulnerability

    Score1-2 - Moderate to High Vulnerability.

    Raw Conservation Status Score

    Score 8 to 13 total points scored out of a possible 19.

 
General Description
Entire-leaved Avens is a mat-forming shrub with prostrate stems which bear naked flower stems that reach up to 10 cm high and arise from leaf rosettes. The leaves have short stalks and lance-shaped blades that are 8-15 mm long with margins that are turned under and entire on the upper half. The upper leaf surface is glabrous, while the lower surface is densely covered with white hair, but glands are absent. The solitary, saucer-shaped, white flowers have a glandular, 5-lobbed calyx and 8-10 spreading, elliptic petals that are ca. 1 cm long. There are numerous stamens and styles. The latter become feathery and 2-4 cm long as the achenes mature.

Phenology
Flowering in July.

Diagnostic Characteristics
The more common D. octopetala is similar, but the leaves have wavy margins to the tip, are broadest near mid-length, and have light brown glands mixed in with the white hair on the undersides of the leaves. Our plants may show introgression with Dryas octopetala, as they may be partially crenate-margined.

Species Range
Present
 


Range Comments
Arctic North America and Greenland, south to New Hampshire, British Columbia, Alberta, and northern Montana. Peripheral.

Summary of Observations Submitted for Montana
Number of Observations: 2

(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
Stony, limestone-derived soil of exposed ridges and plateaus in the alpine zone.

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Bamberg, S. A. 1964. Ecology of the vegetation and soils associated with calcareous parent material in the alpine region of Montana. Ph.D dissertation. University of California, Davis. 106 pp. (Diss. Abstr. 25:4370)
    • Bamberg, S. A., and J. Major. 1968. Ecology of the vegetation and soils associated with calcareous parent materials in three alpine regions of Montana. Ecological Monographs 38(2):127-167.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, L.J. Gillespie, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, A.K. Brysting and H. Solstad (1999 onwards). Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. Version: 29th April 2003
  • Web Search Engines for Articles on "Entire-leaved Avens"
  • Additional Sources of Information Related to "Dicots"
Login Logout
Citation for data on this website:
Entire-leaved Avens — Dryas integrifolia.  Montana Field Guide.  .  Retrieved on , from