Name:
Pseudotsuga menziesii Forest Alliance
Reference:
Western Ecology Working Group of...
Description:
This alliance includes evergreen forests dominated by Pseudotsuga menziesii occurring from Vancouver Island south through the Cascades and Coastal Ranges of northern California, through the Great Basin and Rocky Mountains, to extreme western Texas and northern Mexico. In the Pacific ranges the dominant species is Pseudotsuga menziesii var. menziesii, while Pseudotsuga menziesii var. glauca is the dominant in forests of the Rocky Mountains, south to Mexico. Currently this alliance includes 49 associations, occurring in 12 states or provinces. Associated species vary with geographic location but can include in the canopy/subcanopy Arbutus menziesii, Acer circinatum, Acer glabrum, Acer grandidentatum, Amelanchier alnifolia, Quercus arizonica, Quercus gambelii, Quercus hypoleucoides, and Quercus rugosa. Typical shrubs and herbs include Arctostaphylos patula, Arctostaphylos uva-ursi, Arnica cordifolia, Bromus ciliatus, Calamagrostis rubescens, Carex geyeri, Festuca arizonica, Festuca occidentalis, Gaultheria shallon, Holodiscus discolor, Jamesia americana, Juniperus communis, Juniperus osteosperma, Linnaea borealis, Mahonia aquifolium (= Mahonia piperiana), Mahonia repens, Muhlenbergia montana, Muhlenbergia virescens, Osmorhiza berteroi, Paxistima myrsinites, Physocarpus malvaceus, Purshia tridentata, Spiraea betulifolia, Symphoricarpos albus, Symphoricarpos occidentalis, Symphoricarpos oreophilus, Thalictrum occidentale, Vaccinium caespitosum, Vaccinium membranaceum, and Viola adunca. In western Texas, this alliance is restricted to upper canyons and slopes at high elevations (6000-8000 feet) in the mountains of the Trans-Pecos, where important associates include Pinus ponderosa var. scopulorum, Pinus strobiformis (Guadalupe Mountains), and Cupressus arizonica (Chisos Mountains).
Accession Code:
VB.CC.18421.PSEUDOTSUGAMENZ
Plot-observations of this Community Concept:
0
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