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A.1501 | EcoArt 2002
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Name: A.1501
Reference: EcoArt 2002
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.1271.A1501
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Nov-1997 to: 17-Mar-2005
     
  • status: accepted
  • Community's Parent: V.A.6.N.f
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: PINUS JEFFREYI WOODED HERBACEOUS ALLIANCE
  Code: A.1501
  Common: Jeffrey Pine Wooded Herbaceous Alliance
(convergence) and Synonyms:
(undetermined) Pinus jeffreyi Wooded Herbaceous Alliance