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Juncus parryi / Sibbaldia procumbens Herbaceous Vegetation | Western Ecology Working Group of...
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Name: Juncus parryi / Sibbaldia procumbens Herbaceous Vegetation Reference: Western Ecology Working Group of... Description: This type has been documented from the high subalpine and alpine zones of both Glacier National Park and Waterton Lakes National Park. This small-patch type is characteristic of snowbed positions from the upper subalpine to well into the alpine zone, from 2010 to 2350 m (6590-7710 feet). It occurs predominantly on gently rolling glaciated terrain, often associated with depressions. Where it occurs on moderate to steep slopes, it apparently is associated with east- to south-facing slopes (receiving positions in the redistribution of snow by prevailing westerlies). Moderately well-drained to well-drained soils are derived from a wide variety of sedimentary parent materials, predominantly siltstone. The ground surface is mostly rock-free with an average of about 4% exposed soil, and litter cover varies widely, from 10 to 85%, with a modal value around 45 to 50%; lichen and bryophyte cover is also highly variable, ranging from nil to 85%. Vascular plant cover varies widely from approaching a scarce vegetation to more than 80%; plant cover is generally less than in the comparable Carex nigricans-dominated snowbed sites. Shrubs do not occur within the type. The dominant aspect is of a mini-tussock grassland with Juncus parryi and Juncus drummondii providing the most cover; other graminoids of high constancy but low cover include Carex paysonis and Danthonia intermedia. Sibbaldia procumbens, widely regarded to be chionophilous species, is consistently present with cover in excess of 10%. Other forbs of high constancy include Arenaria capillaris, Antennaria alpina, Hieracium gracile, Erigeron peregrinus, and Packera streptanthifolia (= Senecio cymbalarioides); with the exception Arenaria capillaris, their coverages seldom exceed 5%.  Accession Code: VB.CC.24980.JUNCUSPARRYISIB Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 09-Feb-2004 to: 17-Nov-2014
	status: accepted Community's Parent: Juncus parryi Herbaceous Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Parry's Rush / Creeping Glow-wort Herbaceous Vegetation   UID: ELEMENT_GLOBAL.2.730760 NatureServe Explorer   Code: CEGL005871   Scientific: Juncus parryi / Sibbaldia procumbens Herbaceous Vegetation (convergence) and Synonyms: (undetermined) Juncus parryi / Sibbaldia procumbens Herbaceous Vegetation