Name:
Pseudotsuga menziesii / Amelanchier alnifolia Forest
Reference:
NatureServe Biotics 2019
Description:
This association has been reported from colluvial slopes, ridges, mountains and canyon walls in northwestern Colorado, northwestern Wyoming and central Montana. In the northern part of its range, stands occur on warm, southerly slopes, whereas in Colorado the type is restricted to cold north-facing slopes. Slopes range from moderate to very steep (over 100%); elevations range from 1220 m in Montana to more than 2250 m in Colorado (4000-8350 feet). Soils are gravelly loams and sandy loams derived from granite or sandstone and often are very rocky. Litter and duff cover much of the unvegetated ground surface. <i>Pseudotsuga menziesii</i> dominates the tree canopy of this association with at least 20% cover, except in Montana, where cover may be as low as 5%. Other trees, such as <i>Pinus albicaulis, Pinus flexilis, Pinus ponderosa, Populus tremuloides</i>, or <i>Juniperus scopulorum</i>, may be present to codominant. In younger stands, these species may have higher cover than <i>Pseudotsuga menziesii</i>. <i>Abies concolor</i> is typically absent. The shrub layer is often dense. Dominant shrubs in the understory include <i>Amelanchier alnifolia, Prunus virginiana, Spiraea betulifolia</i>, and <i>Symphoricarpos</i> spp., as well as lesser amounts of <i>Rosa</i> spp., <i>Ribes</i> spp., <i>Juniperus communis, Mahonia repens</i>, and <i>Paxistima myrsinites</i>. Graminoids are rare to abundant; <i>Pseudoroegneria spicata, Bromus carinatus, Achnatherum lettermanii, Elymus trachycaulus, Carex geyeri</i>, and <i>Agrostis scabra</i> are common species. Common forbs include <i>Eurybia conspicua, Eucephalus engelmannii, Helianthella uniflora, Fragaria virginiana, Symphyotrichum ascendens</i>, and <i>Maianthemum racemosum</i>.
Accession Code:
urn:lsid:vegbank.org:commConcept:29329-{4ED784CF-3EA4-4080-B013-4A4B311DA1EB}
Plot-observations of this Community Concept:
0
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