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CEGL000816 Pinus jeffreyi / Ceanothus pumilus Wooded Grassland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Jeffrey Pine / Siskiyou-mat Wooded Grassland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This community is found in the Klamath-Siskiyou region of Oregon and California. Sites include a variety of slopes (0-45%) and all aspects except east. Elevations range from 360-1180 m (1180-3860 feet) in Oregon and 1390-1630 m (4560-5340 feet) in California. Exposed rocks and clay soils are typical with serpentine and peridotite parent material. An open overstory with a good variety of tree species, sizes, and heights over a sparsely vegetated understory is typical. Pinus jeffreyi dominates the open tree canopy with average cover of 10-25%. Calocedrus decurrens is also present and supports 5-10% cover. The dwarf-shrub layer is codominated by Ceanothus pumilus with 8-29% cover (although due to its stature of less than 10 cm in height, it appears more like an herbaceous layer). Arctostaphylos canescens and Arctostaphylos viscida are also very abundant. The herbaceous layer is dominated by the perennial grasses, Achnatherum lemmonii and Festuca idahoensis ssp. roemeri at many sites with 50% and 32% cover, respectively. Total forb cover averages 13% and is dominated by Horkelia sericata (11% cover).
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: This association combines three Pinus jeffreyi savanna communities described from the Klamath Mountains: Pinus jeffreyi - Calocedrus decurrens / Ceanothus pumilus (Jimerson et al. 1995) with Pinus jeffreyi / Arctostaphylos canescens / Festuca idahoensis (Atzet et al. 1996) and Pinus jeffreyi / Ceanothus pumilus (Atzet and Wheeler 1984).
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: An open overstory with a good variety of tree species, sizes, and heights over a sparsely vegetated understory is typical. Pinus jeffreyi dominates the open tree canopy with average cover of 10-25%. Calocedrus decurrens is also present and supports 5-10% cover. The dwarf-shrub layer is codominated by Ceanothus pumilus (= Ceanothus prostratus ssp. pumilus) with 8-29% cover (although due to its stature of less than 10 cm in height, it appears more like an herbaceous layer). Arctostaphylos canescens and Arctostaphylos viscida are also very abundant. The herbaceous layer is dominated by the perennial grasses, Achnatherum lemmonii (= Stipa lemmonii) and Festuca idahoensis ssp. roemeri (= Festuca roemeri) at many sites with 50% and 32% cover, respectively. Total forb cover averages 13% and is dominated by Horkelia sericata (11% cover).
Dynamics: No Data Available
Environmental Description: Sites include a variety of slopes (0-45%) and all aspects except east. Elevations range from 360-1180 m (1180-3860 feet) in Oregon and 1390-1630 m (4560-5340 feet) in California. Exposed rocks and clay soils are typical with serpentine and peridotite parent material.
Geographic Range: This type is found only in the Klamath-Siskiyou region. Stands are documented from Mad River Ranger District, California to north of Grants Pass, Oregon.
Nations: US
States/Provinces: CA?, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.688028
Confidence Level: Moderate
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.Nd Vancouverian Forest & Woodland Division | D192 | 1.B.2.Nd |
| Macrogroup | 1.B.2.Nd.2 Incense-cedar - Jeffrey Pine - Sierra White Fir Forest Macrogroup | M023 | 1.B.2.Nd.2 |
| Group | 1.B.2.Nd.2.a Incense-cedar - Sugar Pine - Sierra White Fir Forest & Woodland Group | G344 | 1.B.2.Nd.2.a |
| Alliance | A3676 Jeffrey Pine - Washoe Pine Mixed Conifer Woodland Alliance | A3676 | 1.B.2.Nd.2.a |
| Association | CEGL000816 Jeffrey Pine / Siskiyou-mat Wooded Grassland | CEGL000816 | 1.B.2.Nd.2.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: > Pinus jeffreyi - Calocedrus decurrens / Ceanothus pumilus (Jimerson et al. 1995)
> Pinus jeffreyi / Arctostaphylos canescens / Festuca idahoensis (Atzet et al. 1996)
> Pinus jeffreyi / Ceanothus pumilus (Atzet and Wheeler 1984)
> Pinus jeffreyi / Arctostaphylos canescens / Festuca idahoensis (Atzet et al. 1996)
> Pinus jeffreyi / Ceanothus pumilus (Atzet and Wheeler 1984)
- Atzet, T. A., D. E. White, L. A. McCrimmon, P. A. Martinez, P. R. Fong, and V. D. Randall. 1996. Field guide to the forested plant associations of southwestern Oregon. Technical Paper R6-NR-ECOL-TP-17-96. USDA Forest Service, Pacific Northwest Region, Portland, OR.
- Atzet, T., and D. L. Wheeler. 1984. Preliminary plant associations of the Siskiyou Mountains Province, Siskiyou National Forest. USDA Forest Service, Pacific Northwest Region, 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.
- Jimerson, T. J., L. D. Hoover, E. A. McGee, G. DeNitto, and R. M. Creasy. 1995. A field guide to serpentine plant associations and sensitive plants in northwestern California. Technical Publication R5-ECOL-TP-006. USDA Forest Service, Pacific Southwest Region, San Francisco, CA.
- 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.