Name:
Pseudotsuga menziesii / Symphoricarpos albus - Holodiscus discolor Forest
Reference:
Western Ecology Working Group of...
Description:
This association occurs below 180 m (600 feet) elevation primarily in the northern portion of the Puget Lowland, Washington (Clallam, Jefferson, San Juan, Island, Skagit), and in the Gulf Islands (and possibly southeastern Vancouver Island), and very rarely in the southern Puget Lowland. This is an evergreen needle-leaved forest, or occasionally woodland, dominated by Pseudotsuga menziesii, with other tree species absent or in small amounts. Deciduous broad-leaved shrubs dominate the understory. A well-developed tall-shrub layer 2-6 m tall is dominated by Holodiscus discolor. A shrub layer 0.5-1.5 m tall is dominated by Symphoricarpos albus and to a lesser extent Rosa gymnocarpa. An often diverse herbaceous layer usually has Bromus vulgaris, Festuca occidentalis, Melica subulata, Galium aparine, Fragaria vesca, Clinopodium douglasii (= Satureja douglasii), Osmorhiza berteroi (= Osmorhiza chilensis), Sanicula crassicaulis, and Trientalis borealis ssp. latifolia (= Trientalis latifolia). This association typically occurs on moderately dry sites, usually on glacial drift, and mostly in a very dry climatic zone where annual precipitation is less than 30 inches. This association is distinguished from similar ones by >10% cover of Symphoricarpos albus, combined with<10% cover of Gaultheria shallon, Tsuga heterophylla, Thuja plicata, and Abies grandis, <20% cover of Arbutus menziesii, and <5% cover of Polystichum munitum.
Accession Code:
VB.CC.24652.PSEUDOTSUGAMENZ
Plot-observations of this Community Concept:
0
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