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Dryas octopetala - Saxifraga spp. Rocky Mountain Alpine Bedrock & Scree Group | NatureServe Biotics 2019
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Name: Dryas octopetala - Saxifraga spp. Rocky Mountain Alpine Bedrock & Scree Group Reference: NatureServe Biotics 2019 Description: This alpine group consists of exposed rock and rubble at or above the upper treeline in the Rocky Mountains, from Alberta and British Columbia, Canada, south into New Mexico, and west into the highest mountain ranges of the Great Basin, eastern Oregon and Washington, and the Sierra Nevada. It is composed of barren and sparsely vegetated alpine substrates, typically including bedrock outcrops, talus and scree slopes, upper mountain slopes, and summits. Vascular plants growing on loose substrates typically have either an extensive shallow root and rhizome system or a massive taproot that anchors the plant. Sparse cover of forbs, grasses, low shrubs and small trees may be present with total vascular plant cover typically less than 25% due to the high cover of exposed rock. Many species are tiny, growing in cracks in rock outcrops. Nonvascular (lichen)-dominated communities are common and may greatly exceed 25% cover in some areas. The lower elevational limit for the alpine zone varies with latitude ranging from near 3660 m (12,000 feet) in the southern extent to near 2286 m (7500 feet) in the northern extent. Exposure to desiccating winds, rocky and sometimes unstable substrates, and a short growing season limit vascular plant growth.  Accession Code: urn:lsid:vegbank.org:commConcept:40240-{A62F5070-D2A6-46EA-9669-DCAD224D03B3} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 09-Nov-2015 to: ongoing
	status: accepted Community's Parent: Dryas octopetala - Carex elynoides - Silene acaulis Alpine Tundra Macrogroup This Community's Level: Group This Community's Children: Show/Hide   Polemonium spp. - Castilleja spp. - Trisetum spp. Alpine Rock Alliance   Rocky Mountain Alpine Nonvascular Bedrock & Scree Alliance   Rocky Mountain Alpine Sparse Herb Bedrock & Scree Alliance   Sierran Alpine Nonvascular Bedrock & Scree Alliance		Names:   UID: ELEMENT_GLOBAL.2.849164 NatureServe Explorer   Code: G571   Scientific: Dryas octopetala - Saxifraga spp. Rocky Mountain Alpine Bedrock & Scree Group