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Dryas integrifolia - Carex spp. Dwarf-shrub Herbaceous Vegetation | Western Ecology Working Group of...
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Name: Dryas integrifolia - Carex spp. Dwarf-shrub Herbaceous Vegetation Reference: Western Ecology Working Group of... Description: This association is documented only from the alpine zone of the Big Snowy Mountains of north-central Montana, though reconnaissance information places it as well in the Tobacco Root Range of southwestern Montana. Stands occur from 2360-2700 m (7750-8850 feet) elevation on gently sloping topography developed on Madison Limestone. This substrate is resistant to chemical weathering, but has been acted upon by frost to produce stepped terraces, rock polygons, sorted/non-sorted frost boils, and 'spotted tundra' (oval, spaced mats of Dryas integrifolia surrounded by rock rubble) and solifluction lobes on lee slopes. Soils are shallow, alkaline, cobbly and covered by a layer of gravels and rock fragments. The mat-forming dwarf-shrub Dryas integrifolia and turf-forming and perennial sedge Carex rupestris are diagnostic for the type and dominate small vegetated patches that are regularly interspersed in a matrix of unvegetated to sparsely vegetated rocky ground. Carex scirpoidea ssp. pseudoscirpoidea (= Carex pseudoscirpoidea), Saxifraga oppositifolia, Polygonum viviparum, Oxytropis sericea, Androsace chamaejasme and Lloydia serotina have high constancy but their individual cover seldom exceeds 5%. This association, in both floristic and environmental param (with some local variation in the forb component), is highly similar to Dryas octopetala - Carex rupestris Dwarf-shrub Herbaceous Vegetation (CEGL001892) which is found from the Canadian Rockies south to Colorado.  Accession Code: VB.CC.18852.DRYASINTEGRIFOL Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Dryas integrifolia Dwarf-shrub Herbaceous Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: White Mountain-avens - Sedge species Dwarf-shrub Herbaceous Vegetation   UID: ELEMENT_GLOBAL.2.683989 NatureServe Explorer   Code: CEGL001890   Scientific: Dryas integrifolia - Carex spp. Dwarf-shrub Herbaceous Vegetation   Common: Alpine Avens / Sedge species (convergence) and Synonyms: (undetermined) Dryas integrifolia - Carex spp. Dwarf-shrub Herbaceous Vegetation