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Calamagrostis purpurascens Herbaceous Alliance | Western Ecology Working Group of...
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Name: Calamagrostis purpurascens Herbaceous Alliance Reference: Western Ecology Working Group of... Description: Vegetation in this alliance is found on higher alpine slopes in scattered locations in the mountains of the Pacific Northwest and in the mountains of east-central Idaho. Stands occur between 2250-2600 m of elevation on southern and western aspects of well-drained, rocky slopes. Slopes are moderate to steep. In the Cascades this alliance 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. Snow accumulation is low and snowmelt is early, between April and early May. Soils are somewhat poorly developed, due to the lack of extreme weathering. Soils are derived from pyroclastic deposits, are classified as Inceptisols, and are well-drained. Stands are small and characterized by a dense cover (>100%) and a diverse flora of herbaceous and cryptogam species; 41 species is the average number per stand. Calamagrostis purpurascens is common only in stands of this alliance, where the species has a relatively high average cover of 30-50%. Carex scirpoidea ssp. pseudoscirpoidea (= Carex pseudoscirpoidea) is a common graminoid associate, and Minuartia obtusiloba (= Arenaria obtusiloba), Oxytropis monticola, and Potentilla diversifolia var. diversifolia are common forb associates. A number of lichen species are often present, including Cornicularia aculeata, Cladonia pyxidata, Cetraria ericetorum, and Cetraria islandica. Adjacent vegetation is often Kobresia myosuroides communities.  Accession Code: VB.CC.19709.CALAMAGROSTISPU Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 01-May-2019
	status: accepted This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: Calamagrostis purpurascens Herbaceous Alliance   Translated: Purple Reedgrass Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.126412 NatureServe Explorer   Code: A.1301