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CEGL000474 Thuja plicata / Clintonia uniflora Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Western Red-cedar / Bride''s Bonnet Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association represents the warmest and driest Thuja plicata-dominated forests. Elevation range is 670 to 1530 m (2200-5000 feet). Stands occur on bottomlands, benches, and lower slopes with gentle to steep gradients, most often on gentle slopes. All aspects are represented. Soils are volcanic ash over glacial till or outwash with variable parent material. Soil textures are silt loams to mostly sandy loams, with high coarse fragments (16-63%). All soils are well- to moderately well-drained. Thuja plicata is dominant in the overstory and in the subcanopy as a reproducing tree. Undergrowth is characterized by scattered mesophytic herbs and subshrubs of which Clintonia uniflora is the most diagnostic. Thuja plicata is dominant or codominant and the characteristic tree (average cover ranges between 35 and 60%). Pseudotsuga menziesii, Larix occidentalis, Pinus contorta, and Abies grandis are often abundant codominants (average cover ranging from 10-30%). The shrub layer is relatively sparse with 5-10% cover. Shrub species present include Paxistima myrsinites, Linnaea borealis, Mahonia repens, and Lonicera utahensis. The herbaceous layer is not abundant, with a high variance in the forb and grass species present. Goodyera oblongifolia, Chimaphila umbellata, Clintonia uniflora, Tiarella trifoliata, Coptis occidentalis, Orthilia secunda, and Viola orbiculata are the more commonly encountered species, but with very low abundance (1-3%), occasionally with as much as 5% cover. Clintonia uniflora, while not present in all stands, is the indicator species for this relatively depauperate type; other indicators include Tiarella trifoliata, Coptis occidentalis, and Adenocaulon bicolor.
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: Thuja plicata is dominant in the overstory and in the subcanopy as a reproducing tree. Undergrowth is characterized by scattered mesophytic herbs and subshrubs of which Clintonia uniflora is the most diagnostic. Thuja plicata is dominant or codominant and the characteristic tree (average cover ranges between 35 and 60%). Pseudotsuga menziesii, Larix occidentalis, Pinus contorta, and Abies grandis are often abundant codominants (average cover ranging from 10-30%). The shrub layer is relative sparse with 5-10% cover. Shrub species present include Paxistima myrsinites, Linnaea borealis, Mahonia repens, Taxus brevifolia, and Lonicera utahensis. The herbaceous layer is not abundant, with a high variance in the forb and grass species present. Goodyera oblongifolia, Chimaphila umbellata, Clintonia uniflora, Tiarella trifoliata, Coptis occidentalis, Orthilia secunda, and Viola orbiculata are the more commonly encountered species, but with very low abundance (1-3%), occasionally with as much as 5% cover. Clintonia uniflora, while not present in all stands, is the indicator species for this relatively depauperate type.
Dynamics: No Data Available
Environmental Description: This association represents the warmest and driest Thuja plicata-dominated forests. It is the most widely distributed association within ~Tsuga heterophylla - Thuja plicata Cool-Mesic Central Rocky Mountain Forest & Woodland Alliance (A3612)$$ in Washington, Idaho and Montana, and reflects the driest sites that can support climax stands of Thuja. Elevation range is 670 to 1530 m (2200-5000 feet). Stands occur on bottomlands, benches, and lower slopes with gentle to steep gradients, most often on gentle slopes. It occurs on all aspects throughout its range, with a tendency to occupy northern aspects in the easternmost part of its range, and warmer aspects (southeast to northwest) in the western portion of the range. Soils are volcanic ash over glacial till or outwash with variable parent material. Some parent materials are calcium-rich, others are granitic. Soil textures are silt loams to mostly sandy loams, with high coarse fragments (16-63%). All soils are well- to moderately well-drained.
Geographic Range: This association is known from northeastern Washington, northern Idaho, and northwestern Montana.
Nations: CA?,US
States/Provinces: BC?, ID, MT, WA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.685134
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.Nb Rocky Mountain Forest & Woodland Division | D194 | 1.B.2.Nb |
| Macrogroup | 1.B.2.Nb.3 Western Hemlock - Grand Fir - Western Larch Mesic Lower Montane Forest Macrogroup | M500 | 1.B.2.Nb.3 |
| Group | 1.B.2.Nb.3.b Western Red-cedar - Western Hemlock Central Rocky Mountain Forest Group | G217 | 1.B.2.Nb.3.b |
| Alliance | A3612 Western Hemlock - Western Red-cedar Cool-Mesic Central Rocky Mountain Forest & Woodland Alliance | A3612 | 1.B.2.Nb.3.b |
| Association | CEGL000474 Western Red-cedar / Bride''s Bonnet Forest | CEGL000474 | 1.B.2.Nb.3.b |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: < Thuja plicata / Clintonia uniflora Habitat Type (Daubenmire and Daubenmire 1968)
= Thuja plicata / Clintonia uniflora Habitat Type, Clintonia uniflora Phase (Pfister et al. 1977)
= Thuja plicata / Clintonia uniflora Habitat Type, Clintonia uniflora Phase (Cooper et al. 1987)
= Thuja plicata / Clintonia uniflora Plant Association (Williams et al. 1995)
= Thuja plicata / Clintonia uniflora Habitat Type, Clintonia uniflora Phase (Pfister et al. 1977)
= Thuja plicata / Clintonia uniflora Habitat Type, Clintonia uniflora Phase (Cooper et al. 1987)
= Thuja plicata / Clintonia uniflora Plant Association (Williams et al. 1995)
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- Zamora, B. A. 1983. Forest habitat types of the Spokane Indian Reservation. Agricultural Research Center, Washington State University Research Bulletin XB-0936-1983.