Antennaria densifolia - Porsild
Dense-leaved Pussytoes
Other English Common Names: Dense-leaf Antennaria
Taxonomic Status: Accepted
Related ITIS Name(s): Antennaria densifolia A.E. Porsild (TSN 185113)
French Common Names: antennaire feuilles denses
Unique Identifier: ELEMENT_GLOBAL.2.146836
Element Code: PDAST0H160
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Antennaria
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Antennaria densifolia
Conservation Status
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NatureServe Status

Global Status: G3G4
Global Status Last Reviewed: 23Jun2016
Global Status Last Changed: 29Jul2013
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G3 - Vulnerable
Reasons: Antennaria densifolia is known from the eastern slope of the MacKenzie Mountains in the District of Mackenzie and from the northern Ogilvie and southern Richardson Mountains in the Yukon Territory. Also known from British Columbia and Alaska. A substantially disjunct population is known from the Anaconda Range of Granite County, Montana. Bayer (1989) confirmed this plant was known from approximately forty populations.
Nation: United States
National Status: N1N2
Nation: Canada
National Status: N3N4 (14Aug2015)

U.S. & Canada State/Province Status
United States Alaska (S1S2), Montana (S1)
Canada British Columbia (S1S2), Northwest Territories (SNR), Yukon Territory (S3S4)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: North America: Found in the Mackenzie Mountains of the District of Mackenzie, in the Yukon Territory in southern Richardson and Ogilvie mountains, and in extreme northwestern and southern British Columbia, Canada; also one disjunct population in Granite County, Montana (Cody 1996). Also in Alaska (Montana Natural Heritage Program 1999).

Number of Occurrences: 21 - 80
Number of Occurrences Comments: Bayer (1989) reports that forty populations of this species are confirmed.

Other NatureServe Conservation Status Information

Distribution
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Global Range: North America: Found in the Mackenzie Mountains of the District of Mackenzie, in the Yukon Territory in southern Richardson and Ogilvie mountains, and in extreme northwestern and southern British Columbia, Canada; also one disjunct population in Granite County, Montana (Cody 1996). Also in Alaska (Montana Natural Heritage Program 1999).

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AK, MT
Canada BC, NT, YT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AK Southeast Fairbanks (CA) (02240), Yukon-Koyukuk (CA) (02290)
MT Deer Lodge (30023), Granite (30039)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Big Hole (10020004)+
17 Flint-Rock (17010202)+
19 Black River (19040204)+, Eagle To Circle (19040401)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Mat-forming, dense-leaved perennial herb with white flowers. Foliage is densely covered with long white hairs (Montana Natural Heritage Program 1999).
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.
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.
Habitat Comments: Subalpine on limestone talus (Cody 1996). Elevation 2788 m (Montana Natural Heritage Program 1999).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 15Apr1999
NatureServe Conservation Status Factors Author: Gries, D.
Element Ecology & Life History Edition Date: 24Sep1994
Element Ecology & Life History Author(s): JM

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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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. 1989a. Patterns of isozyme variation in western North American Antennaria (Asteraceae: Inuleae): II. diploid and polyploid species of section Alpinae. American Journal of Botany 76(5):679-691.

  • Bayer, R.J. 1989b. A systematic and phytogeographic study of Antennaria aromatica and A. densifolia (Asteraceae: Inuleae) in the western North American cordillera. Madrono 36(4):248-259.

  • Cody, W.J. 1996. The flora of the Yukon Territory. National Research Council of Canada Research Press, Ottawa, Canada. 643 pp.

  • Flora of North America Editorial Committee. 2006a. Flora of North America North of Mexico. Vol. 19. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York. xxiv + 579 pp.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Montana Natural Heritage Program. 1999. April 1 - last update. Species Information: Antennaria densifolia. Montana Natural Heritage Program. Online. Available: http://orion2.nris.state.mt.us/mtnhp/plants/index.html Accessed 1999, April 14.

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