Goose-grass Sedge - Carex plectocarpa
Carex lenticularis var. dolia
State Rank Reason (see State Rank above)
Known in Montana primarily from Glacier National Park and from one population in the Absarokas. Some plants in the Logan Pass area are subject to trampling by hikers. Otherwise, the potential for negative impacts to the species appears to be low.
- Details on Status Ranking and Review
Score1-2 - Small to Moderate. Population size is imprecisely known but is believed to be >2,000 individuals and <100,000 individuals.
CommentLikely over 10,000 plants but available data are imprecise.
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
CommentGlobal range includes Glacier National Park and the Beartooth Plateau.
Area of Occupancy
Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).
CommentKnown from 5 subwatersheds.
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).
Score0-1 - Stable to Minor Declines:
Score1 - Medium: 11-30% of the populations are being negatively impacted or are likely to be impacted by one or more activities or agents, which are expected to result in decreased populations and/or habitat quality and/or quantity.
CommentTrampling at the Logan Pass area population has been identified as a potential impact.
Score0-1 - Low to Moderate Vulnerability.
Raw Conservation Status Score
8 to 11 total points scored out of a possible 19.
Caespitose. Stems ascending to prostrate, 5–30 cm. Leaves basal and cauline; blades 1–3 mm wide. Inflorescence of 3 or 4 short-pedunculate, overlapping spikes; lowest bract shorter or longer than the inflorescence. Spikes 8–20 mm long; uppermost bisexual with male flowers below; lower spikes female. Perigynia ovate, ascending, green and purple-blotched, 2–3 mm long with a beak, ca. 0.2 mm long; stigmas 2. Female scales narrowly ovate, blackish with a pale midvein, shorter than the perigynia. Achene 2-sided, smaller than the perigynium (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Fruit mature in late July-August.
Carex is a very large genus, making identification of individual species sometimes difficult. Specimens with mature fruit are necessary for positive identification. Perhaps the best field characters are the loose tussocks with the leaves and stems generally growing at a near-horizontal angle to the ground.
Endemic to Glacier National Park, Park County, MT and adjacent WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Shallow, wet, stony soil around streams in the alpine zone.
- Literature Cited AboveLegend: View Online Publication
- Dragon J.A. and D.S. Barrington. 2009. Systematics of the Carex aquatilis and C. lenticularis Lineages: Geographically and Ecologically Divergent Sister Clades of Carex Section Phacocystis (Cyperaceae). American Journal of Botany 96(10): 1896-1906.
- Additional ReferencesLegend: View Online Publication
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- Hermann, F.J. 1964. A new Carex from Glacier National Park, Montana. Leaflets Western Botany 10:65-68.
- Lesica, P. 1988. Report on the conservation status of Carex lenticularis var. Dolia, a candidate threatened species. Unpublished report, Glacier National Park, Montana 50 pp.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Standley, Lisa A. 1985. "Systematics of the Acutae Group of Carex (Cyperaceae) in the Pacific Northwest". Systematic Botany Monographs. 7: 1-106.