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Pinus jeffreyi Wooded Herbaceous Alliance | Western Ecology Working Group of...
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Name: Pinus jeffreyi Wooded Herbaceous Alliance Reference: Western Ecology Working Group of... Description: Stands in this alliance occur in the mountains of northwestern California and southwestern Oregon. Elevations range from 380-2400 m in Oregon and 60-2900 m in California. The climate throughout most of this alliance's range is Mediterranean, with warm, dry summers and moist winters. Precipitation ranges from 60-150 cm per year, falling mostly as rain. The bulk of the rain falls between November and May. Stands occur on rolling topography with moderately steep to steep slopes (12-60%). Stands occur on all aspects, except north. Soils are well-drained, gravelly clays and clay loams with 0-25% cobbles. Average bare ground and rock cover is less than 20% each. Most commonly stands are found on serpentine, mixed-ultramafic with metavolcanics and peridotite-derived soils. Vegetation included in this alliance has a sparse canopy of trees (10-25% cover), over a sparse to dense herbaceous layer. The evergreen needle-leaved conifer Pinus jeffreyi dominates the tree layer. Other common trees include Arbutus menziesii, Calocedrus decurrens, Pseudotsuga menziesii, and Quercus chrysolepis. The shrub layer is sparse to moderately dense (5-60% cover). Frequent shrubs are Ceanothus pumilus (= Ceanothus prostratus ssp. pumilus), Ceanothus cuneatus, and Arctostaphylos canescens. The sparse to dense (1-90% cover) herbaceous layer is dominated by perennial graminoids such as the cool-season, medium-tall, bunchgrass Festuca idahoensis, with Koeleria macrantha, Elymus glaucus, and Elymus elymoides frequently present. Forb cover is sparse (<20%) and may include Achillea millefolium, Allium falcifolium, Castilleja applegatei, Eriogonum umbellatum, Eriophyllum lanatum, and Phlox divaricata.  Accession Code: VB.CC.22309.PINUSJEFFREYIWO 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: Pinus jeffreyi Wooded Herbaceous Alliance   Translated: Jeffrey Pine Wooded Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.126067 NatureServe Explorer   Code: A.1501