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Montana Field Guide

Montana Field Guides

Dense-leaved Pussytoes - Antennaria densifolia

Species of Concern

Global Rank: G3G4
State Rank: S1
* (see State Rank Reason below)

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
MNPS Threat Rank:
C-value: 9

External Links






State Rank Reason (see State Rank above)
Known from one high elevation site in the Anaconda-Pintler Wilderness on the border of Deerlodge and Granite counties. The single occurrence is in a designated wilderness, which should protect it from most human-caused disturbance. However, it is susceptible to trail-building and maintenance activities.
 
General Description
Dense-leaved Antennaria is a low, mat-forming perennial with stems which are 2-6 cm high and which spread by prostrate runners from a branched rootcrown clothed in old leaf bases. The broadly spoon-shaped basal leaves are 3-6 mm long, while the alternate stem leaves are shorter and narrowly lance-shaped with small, curled tips. The foliage is densely covered with long white hairs. 2-5 flower heads are borne atop the stems, and male and female flowers are borne on different plants. Female flower heads have 3-4 series of overlapping, narrowly lance-shaped involucral bracts which are 4-5 mm long with brownish, papery tips, in addition to having white disk flowers which are ca. 3 mm long. Ray flowers are lacking. Male heads are slightly broader with shorter involucral bracts. The seed has long, stiff bristles at the top.

Phenology
Flowering in July-August.

Diagnostic Characteristics
There are many species of small-leaved, mat-forming Antennaria. Only 2 other species have papery tips of involucral bracts that are brownish: A. umbrinella has longer, more lance-shaped leaves, and A. aromatica has foliage with glandular hairs and basal leaves that are usually greater than 6 mm long. A hand lens is necessary to discern the diagnostic characters.

Species Range
Present
 


Range Comments
AK to MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 8

(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
Limestone talus near or above timberline.

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View Online Publication
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    • Achuff, P. L. and L. S. Roe. 1992. Botanical survey of the Goat Flat proposed Research Natural Area, Deerlodge National Forest. Unpublished report to the Deerlodge National Forest. Montana Natural Heritage Program, Helena, MT. 31 pp.
    • Bayer, R.J. 1989. A Systematic and Phytogeographic Study of Antennaria aromatica and A. densifolia...madrono.
    • Bayer, R.J. 1989. Patterns of isozyme variation in western North American Antennaria (Asteraceae: inuleae) II. Diploid and polyploid species of section Alpinae. American Journal of Botany 76:679-691.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Montana Natural Heritage Program. 1999. April 1 - last update. Species Information: Antennaria densifolia. Montana Natural Heritage Program.
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Citation for data on this website:
Dense-leaved Pussytoes — Antennaria densifolia.  Montana Field Guide.  .  Retrieved on , from