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Populus tremuloides - (Populus grandidentata) Rocky Woodland | NatureServe Biotics 2019
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Name: Populus tremuloides - (Populus grandidentata) Rocky Woodland Reference: NatureServe Biotics 2019 Description: This aspen rocky woodland type is found in on dry-mesic rocky and sandy sites of the subboreal regions of central Canada and adjacent United States. Stands occur on ridges, with occasional exposed bedrock with shallow soils, or on sandy soils. Exposed bedrock ranges from 5-20%. These sites are rapidly drained. The vegetation contains a tree canopy with a mix of <i>Populus tremuloides, Betula papyrifera</i> and, occasionally, <i>Populus grandidentata</i>. Percent cover ranges from 20-60%. There is often a subcanopy (usually about 30% cover) containing the species in the canopy as well as <i>Abies balsamea, Acer rubrum</i> and, less commonly, <i>Quercus ellipsoidalis</i>. In the patches of soil that exist between the bedrock outcrops, vegetation can be more forest-like. These areas contain a short-shrub layer of <i>Corylus cornuta</i> and <i>Populus</i> spp. with cover ranging from 20-90%. The herb layer in these patches consists of <i>Aralia nudicaulis, Pteridium aquilinum</i> and <i>Eurybia macrophylla</i> with cover typically in the 60-70% range. The bedrock outcrops often contain a low cover of <i>Vaccinium</i> spp. The herb layer associated with bedrock typically contains <i>Woodsia ilvensis, Schizachne purpurascens</i> and <i>Elymus trachycaulus</i>, with cover usually low (less than 25%). These bedrock areas may also contain a low cover of <i>Pleurozium schreberi</i> and <i>Cladonia rangiferina, Cladonia arbuscula ssp. mitis</i> and <i>Cladonia stellaris</i>. Diagnostic features are the canopy of <i>Populus tremuloides, Populus grandidentata</i>, and/or <i>Betula papyrifera</i>, with less than 60% cover and canopy closure prevented by the presence of exposed bedrock.  Accession Code: urn:lsid:vegbank.org:commConcept:31395-{8F8517F7-984F-4607-A382-5308947A66F3} Plot-observations of this Community Concept: 3
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Jun-2013 to: ongoing
	status: accepted Community's Parent: Populus tremuloides - Picea glauca Subboreal Rocky Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.684258 NatureServe Explorer   Code: CEGL002487   Translated: Quaking Aspen - (Bigtooth Aspen) Rocky Woodland   Common: Mixed Aspen Rocky Woodland   Scientific: Populus tremuloides - (Populus grandidentata) Rocky Woodland (convergence) and Synonyms: (similar) Populus tremuloides - (Populus grandidentata) Rocky Woodland (similar) Populus tremuloides - (Populus grandidentata) Rocky Woodland (similar) CEGL002487