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Sphaeromeria argentea - Achnatherum swallenii Herbaceous Vegetation | Western Ecology Working Group of...
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Name: Sphaeromeria argentea - Achnatherum swallenii Herbaceous Vegetation Reference: Western Ecology Working Group of... Description: This association is found in the mountains of central Idaho, where it occurs on alluvial fans at elevations from approximately 1890 to 1980 m (6200-6500 feet). These fans are a complex of interlayered materials consisting of boulders, cobbles, and pebbles mixed with sand, silt, and clay. The soils are highly variable, in some sites derived from sand and in others derived from clay. Most of the ground surface is covered by a cobble or boulder pavement, resulting from the removal of fine-grained materials by wind and surface runoff. The soils associated with this vegetation type occur on alluvial flats and are dry gravelly loams, with shallow rooting depths and a windswept surface. A low and sparsely vegetated appearance is characteristic of this association, similar to windswept tundra vegetation. The dominant species, <i>Sphaeromeria argentea (= Tanacetum nuttallii)</i>, is a broad-leaved suffrutescent perennial forb less than 0.2 m in height. The perennial bunchgrass <i>Achnatherum swallenii (= Oryzopsis swallenii)</i> is the most common graminoid and is usually up to 0.4 m in height. Other forbs occurring include <i>Phlox hoodii ssp. muscoides (= Phlox muscoides), Ionactis alpina (= Aster scopulorum)</i>, and <i>Penstemon pumilus</i>.  Accession Code: VB.CC.32558.CEGL001993 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Nov-2014 to: 01-May-2019
	status: accepted This Community's Level: association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.689768 NatureServe Explorer   Translated: Silver Chicken-sage - Swallen's Needlegrass Herbaceous Vegetation   Scientific: Sphaeromeria argentea - Achnatherum swallenii Herbaceous Vegetation   Code: CEGL001993