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Betula occidentalis Seasonally Flooded Shrubland Alliance | Western Ecology Working Group of...
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Name: Betula occidentalis Seasonally Flooded Shrubland Alliance Reference: Western Ecology Working Group of... Description: This alliance occurs on stream benches and floodplains in narrow to moderately wide valleys and hillside seeps in the mountains and foothills across much of the western U.S. Surface water is present for extended periods during the growing season. The water table, after flooding ceases, is variable, extending from saturated to well below the ground surface. Substrates are typically alluvial and range from fairly shallow, finer-textured soils to gravel and boulders. Soils usually have signs of saturation (mottles). The vegetation is characterized by a nearly continuous tall-shrub to small-tree canopy dominated by Betula occidentalis along the streambank. Other shrub species include Alnus incana, Cornus sericea, Dasiphora fruticosa ssp. floribunda (= Pentaphylloides floribunda), Salix exigua, Amelanchier utahensis, Prunus virginiana, and Salix monticola. Along narrow valleys at higher elevations, conifers may overhang the stream edge. Herbaceous undergrowth is usually limited because of the dense shrub canopy. Forb species include Maianthemum stellatum, Heracleum sphondylium, Thalictrum fendleri, and Rudbeckia laciniata. Graminoid cover is usually low and includes the following species: Carex utriculata, Carex pellita (= Carex lanuginosa), Carex microptera, Carex nebrascensis, Glyceria spp., Juncus balticus, and introduced hay grasses. Diagnostic of this alliance is the Betula occidentalis-dominated tall-shrub layer that occurs on sites that are flooded for extended periods during the growing season.  Accession Code: VB.CC.20891.BETULAOCCIDENTA 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: Betula occidentalis Seasonally Flooded Shrubland Alliance   Translated: Water Birch Seasonally Flooded Shrubland Alliance   UID: HIGHER_CLASS_UNIT.2.125666 NatureServe Explorer   Code: A.996