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CEGL001737 Eriogonum microthecum - Physaria oregona Dwarf-shrubland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Slender Buckwheat - Oregon Twinpod Dwarf-shrubland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This type sporadically occurs in the Snake River and Imnaha River canyons, on hydrothermally altered basalt outcrops. These are found in canyons at the intersection of Oregon, Washington and Idaho, although it appears to be very restricted in Idaho. The unique substrates are barren, being approximately 1 dm of pea gravels or sands covering basalt. They are always found on south-facing slopes, and are often quite steep, with a mean slope of 42%. Unlike most areas in Hells Canyon National Recreational Area, fires do not carry through these barren communities. The vegetation is sparse, with about 90% of the sites unvegetated (6% rock, 82% pavement, 5% bare ground, 3% moss or lichen, and 1% litter, mean cover). The dominant vegetation includes Physaria oregona, Eriogonum strictum, Eriogonum microthecum, Oenothera caespitosa, Pseudoroegneria spicata and Phacelia heterophylla. Introduced annual grasses (Bromus tectorum and Bromus briziformis) are present at most sites as well. Various other native forbs can often be found. The type is better distinguished by the harsh and unusual environment, than species composition. Physaria oregona and either Eriogonum strictum or Eriogonum microthecum are present, as is Oenothera caespitosa. This combination of species on a steep, south-facing barren is characteristic.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: No Data Available
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: No Data Available
Dynamics: No Data Available
Environmental Description: No Data Available
Geographic Range: Minor community type found on a limited and unique substrate in the vicinity of the Snake River Canyon at the Idaho, Oregon, and Washington state boundaries. Primarily between Lower Granite Dam, Washington, and the Imnaha Canyon, Oregon
Nations: US
States/Provinces: ID, OR, WA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689814
Confidence Level: Low
Confidence Level Comments: No Data Available
Grank: G2
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 3 Desert & Semi-Desert Class | C03 | 3 |
| Subclass | 3.B Cool Semi-Desert Scrub & Grassland Subclass | S11 | 3.B |
| Formation | 3.B.1 Cool Semi-Desert Scrub & Grassland Formation | F033 | 3.B.1 |
| Division | 3.B.1.Ne Western North American Cool Semi-Desert Scrub & Grassland Division | D040 | 3.B.1.Ne |
| Macrogroup | 3.B.1.Ne.2 Little Sagebrush - Black Sagebrush - Scabland Sagebrush Steppe & Shrubland Macrogroup | M170 | 3.B.1.Ne.2 |
| Group | 3.B.1.Ne.2.a Scabland Sagebrush - Buckwheat species Dwarf-shrubland & Steppe Group | G307 | 3.B.1.Ne.2.a |
| Alliance | A1107 Slender Buckwheat Dwarf-shrubland Alliance | A1107 | 3.B.1.Ne.2.a |
| Association | CEGL001737 Slender Buckwheat - Oregon Twinpod Dwarf-shrubland | CEGL001737 | 3.B.1.Ne.2.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Eriogonum microthecum - Physaria oregona Habitat Type (Daubenmire 1970)
= Eriogonum spp. / Physaria oregona Plant Association (Johnson and Simon 1985)
= Eriogonum spp. / Physaria oregona Plant Association (Johnson and Simon 1987)
= Eriogonum spp. / Physaria oregona Plant Association (Johnson and Simon 1985)
= Eriogonum spp. / Physaria oregona Plant Association (Johnson and Simon 1987)
- 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.
- Daubenmire, R. F. 1970. Steppe vegetation of Washington. Washington State University Agricultural Experiment Station Technical Bulletin No. 62. 131 pp.
- Johnson, C. G., Jr., and S. A. Simon. 1987. Plant associations of the Wallowa-Snake Province Wallowa-Whitman National Forest. Technical Paper R6-ECOL-TP-255A-86. USDA Forest Service, Pacific Northwest Region, Wallowa-Whitman National Forest. 399 pp. plus appendices.
- Johnson, C. G., and S. A. Simon. 1985. Plant associations of the Wallowa Valley Ranger District, Part II: Steppe. USDA Forest Service, Pacific Northwest Region, Wallowa-Whitman National Forest. 258 pp.
- Johnston, B. C. 1987. Plant associations of Region Two: Potential plant communities of Wyoming, South Dakota, Nebraska, Colorado, and Kansas. R2-ECOL-87-2. USDA Forest Service, Rocky Mountain Region. Lakewood, CO. 429 pp.
- 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.
- ORNHP [Oregon Natural Heritage Program]. No date. Unpublished data files. Oregon Natural Heritage Program, The Nature Conservancy, Portland, OR.
- WNHP [Washington Natural Heritage Program]. 2018. Unpublished data files. Washington Natural Heritage Program, Department of Natural Resources, Olympia, WA.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.