Print Report
CEGL002688 Pinus ponderosa - Juniperus occidentalis / Artemisia tridentata - Purshia tridentata Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Ponderosa Pine - Western Juniper / Big Sagebrush - Antelope Bitterbrush Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This is a woodland association found in the Blue Mountains and eastern Cascades from Oregon and northern California. Stands include all aspects and slopes, with elevations ranging from 1370 to 1830 m (4500-6000 feet) in elevation. Sites are on basalts, andesite or colluvium, with very stony or shallow soils. In the southern Cascades, these woodlands are often on pumice. They are codominated by Juniperus occidentalis and Pinus ponderosa. Tall shrubs, including Artemisia tridentata (ssp. tridentata, ssp. wyomingensis, and ssp. vaseyana all are reported from stands of this type), Purshia tridentata, and Cercocarpus ledifolius are always present. Generally, Purshia or Artemisia are codominant, although only one or the other can be present. Other shrubs include Ericameria nauseosa, Amelanchier alnifolia, and Artemisia rigida.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: As a result of review of data, CEGL001725 and CEGL001726 have been lumped into this type. There are some stands along the eastern Cascades which have high cover of Purshia tridentata and no Artemisia tridentata, and were the original basis for CEGL001726. However, these are fairly limited, and more ecotonal than the others, which generally have both understory shrubs. Also, it is being moved from the Western juniper woodland alliance to the Ponderosa pine woodland alliance, since this is more of a pine than juniper woodland type. It is clearly an ecotonal or transitional community, but is widespread enough that it merits recognition as an association, and was described as one by Hopkins 1979. However, there is not sufficient data to merit distinctions between the two different types. It occurs at the boundary between the Juniper and Ponderosa pine zone, as well as on dry ridges in the mountains, or on steep north slopes or rimrock in the Juniper zone, but is fairly widespread in eastern Oregon and in adjacent California, occupying large enough areas to be mapped at 1:100,000 from satellite images.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Stands are codominated by Juniperus occidentalis and Pinus ponderosa. In the sampled plots, pine dominates the overstory, with between 5 and 50% cover, with juniper having between 1-20% cover in a lower tree layer. Tall shrubs, including Artemisia tridentata (ssp. tridentata, ssp. wyomingensis, and ssp. vaseyana all are reported from stands of this type), Purshia tridentata and Cercocarpus ledifolius are always present, between 1 and 60% cover. Generally, Purshia or Artemisia are codominant, although only one or the other can be present. Other shrubs include Ericameria nauseosa (= Chrysothamnus nauseosus), Amelanchier alnifolia, and Artemisia rigida.
Dynamics: No Data Available
Environmental Description: Stands include all aspects and slopes, with elevations ranging from 1370 to 1830 m (4500-6000 feet) in elevation. Sites are on basalts, andesite or colluvium, with very stony or shallow soils. In the southern Cascades, these woodlands are often on pumice.
Geographic Range: This community is found throughout the eastern Cascades of Oregon and northern Modoc Plateau of northeastern California, and throughout the Blue Mountains. It has not been reported from Idaho, and if it is there, it will be quite rare.
Nations: US
States/Provinces: CA, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.684207
Confidence Level: Low
Confidence Level Comments: No Data Available
Grank: G4
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 1 Forest & Woodland Class | C01 | 1 |
| Subclass | 1.B Temperate & Boreal Forest & Woodland Subclass | S15 | 1.B |
| Formation | 1.B.2 Cool Temperate Forest & Woodland Formation | F008 | 1.B.2 |
| Division | 1.B.2.Nb Rocky Mountain Forest & Woodland Division | D194 | 1.B.2.Nb |
| Macrogroup | 1.B.2.Nb.2 Ponderosa Pine - Douglas-fir - Limber Pine Central Rocky Mountain Dry Forest Macrogroup | M501 | 1.B.2.Nb.2 |
| Group | 1.B.2.Nb.2.a Ponderosa Pine Central Rocky Mountain Open Woodland Group | G213 | 1.B.2.Nb.2.a |
| Alliance | A3446 Ponderosa Pine / Shrub Understory Central Rocky Mountain Woodland Alliance | A3446 | 1.B.2.Nb.2.a |
| Association | CEGL002688 Ponderosa Pine - Western Juniper / Big Sagebrush - Antelope Bitterbrush Woodland | CEGL002688 | 1.B.2.Nb.2.a |
Concept Lineage: These 2 types have been lumped into the PIPO-JUOC/ARTR-(PUTR) Woodland
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Ponderosa Pine - Juniper / Mountain Mahogany - Bitterbrush - Big Sagebrush / Fescue (Hopkins 1979a)
- Baker, W. 1980b. Inventory of Wildhaven Preserve and vicinity, and an analysis of habitats. Unpublished report prepared for The Nature Conservancy, Portland, OR.
- Bourgeron, P. S., and L. D. Engelking, editors. 1994. A preliminary vegetation classification of the western United States. Unpublished report. The Nature Conservancy, Western Heritage Task Force, Boulder, CO. 175 pp. plus appendix.
- Hopkins, W. E. 1979a. Plant associations of the Fremont National Forest. Technical Report R6-ECOL-79-004. USDA Forest Service, Pacific Northwest Region, Portland.
- Kagan, J. S., J. A. Christy, M. P. Murray, and J. A. Titus. 2004. Classification of native vegetation of Oregon. January 2004. Oregon Natural Heritage Information Center, Portland. 52 pp.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.