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A.1306 | EcoArt 2002
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Name: A.1306 Reference: EcoArt 2002 Description: Vegetation in this alliance is found in the alpine zone of the North Cascade Range of Washington and British Columbia. Stands occur between 2200 and 2600 m elevation on all aspects of dry, well-drained slopes. The vegetation type is restricted to the eastern side of the North Cascades where a continental climate predominates. The mean annual precipitation is 60 cm with only 15 cm of the precipitation falling in the summer. Snowmelt is early, between mid-April and early May. Soils are somewhat poorly developed, due to the lack of extreme weathering. Soils are derived from pyroclastic deposits and are classified as Inceptisols. The A horizon is moderately thick (4-10 cm), has a dense mat of mainly fine roots, and is covered with a layer of graminoid litter. Soils are well-drained and have a pH between 5.2 and 6.0. The vegetation in this alliance forms extensive stands on dry, well-drained, alpine slopes on the eastern side of the North Cascade Range. Stands are characterized by a dense cover (>100%) and a diverse flora of herbaceous and cryptogam species; 35 species is the average number per stand. ~Carex scirpoidea ssp. pseudoscirpoidea (= Carex pseudoscirpoidea)$ is commonly found in other North Cascade tundra, but dominates stands in this alliance with 20-50% cover. ~Potentilla diversifolia var. diversifolia, Minuartia obtusiloba (= Arenaria obtusiloba), Carex phaeocephala$, and ~Festuca brachyphylla$ are common herbaceous associates. The bryophytes ~Tortula ruralis$ and ~Bryum weigilii$ and the lichens ~Cetraria islandica$ and ~Trapeliopsis granulosa (= Lecidea granulosa)$ are often present. ~Carex scirpoidea ssp. pseudoscirpoidea$ stands grade into ~Danthonia intermedia$ communities downslope.  Accession Code: VB.CC.1078.A1306 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Mar-2005
	status: accepted Community's Parent: V.A.5.N.g This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: CAREX SCIRPOIDEA SSP. PSEUDOSCIRPOIDEA HERBACEOUS ALLIANCE   Code: A.1306   Common: Western Single-spike Sedge Herbaceous Alliance (convergence) and Synonyms: (undetermined) Carex scirpoidea ssp. pseudoscirpoidea Herbaceous Alliance