International ecological classification standard: Terrestrial Ecological Classifications Sagebrush Vegetation Classification for the Western United States: Plant Associations and Alliances
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- CEGL001716– Juniperus occidentalis / Artemisia arbuscula / Festuca idahoensis Wooded Herbaceous Vegetation
- CEGL001715– Juniperus occidentalis / Artemisia arbuscula / Poa secunda Wooded Herbaceous Vegetation
- CEGL001717– Juniperus occidentalis / Artemisia arbuscula / Pseudoroegneria spicata Wooded Herbaceous Vegetation
- CEGL001718– Juniperus occidentalis / Artemisia rigida / Poa secunda Wooded Herbaceous Vegetation
- CEGL001722– Juniperus occidentalis / Artemisia tridentata - Purshia tridentata Wooded Herbaceous Vegetation
- CEGL001719– Juniperus occidentalis / Artemisia tridentata / Carex filifolia Wooded Herbaceous Vegetation
- CEGL001720– Juniperus occidentalis / Artemisia tridentata / Festuca idahoensis Wooded Herbaceous Vegetation
- CEGL001721– Juniperus occidentalis / Artemisia tridentata / Pseudoroegneria spicata Wooded Herbaceous Vegetation
V. Herbaceous VegetationV.A.6.N.f. Medium-tall temperate or subpolar grassland with a sparse needle-leaved evergreen or mixed tree layerA.1500–Juniperus occidentalis Wooded Herbaceous AllianceWestern Juniper Wooded Herbaceous Alliance Stakeholders: West Classif. Resp.: West ALLIANCE CONCEPT Summary: Stands of this alliance are widely distributed along the northern and western margins of the Great Basin, from southwestern Idaho to northeastern California, from 200 m to over 1500 m elevation. Throughout the range the climate is semi-arid, with 23-36 cm of precipitation annually. Most of the precipitation is winter rain. The temperature regime is cool summer-continental, with a wide range in diurnal temperatures and night frosts through most of the year. Summer lightning storms and associated fires are common in the environments where this type occurs and are presumably important in structuring the vegetation. Generally soils are medium-textured, with abundant coarse fragments, and derived from volcanic parent materials. In central Oregon, the center of its range, vegetation of this alliance is found on all aspects and slope positions. Vegetation within this alliance is usually characterized by a sparse overstory of Juniperus occidentalis. Cercocarpus ledifolius, a tall shrub or small tree, may also be common. Other shrubs which commonly occur in these woodlands are Purshia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), Chrysothamnus viscidiflorus, Ribes cereum, and Artemisia rigida, Artemisia arbuscula or Artemisia tridentata. The herbaceous layer is usually comprised of annual and perennial grasses such as Pseudoroegneria spicata, Festuca idahoensis, Poa secunda, Koeleria macrantha, and Stipa spp. Common forbs include Achillea millefolium, Balsamorhiza spp., and Trifolium macrocephalum. Adjacent vegetation is most commonly Pinus ponderosa forests, Juniperus occidentalis woodlands, or Artemisia steppe. Classification Comments: Internal Comments: Similar Alliances: Juniperus occidentalis Wooded Tall Herbaceous Alliance (A.1489) Juniperus occidentalis Woodland Alliance (A.535) Similar Alliance Comments: This alliance typically contains a sparse canopy of scattered Juniperus occidentalis within a matrix of herbaceous, usually graminoid vegetation. Although the herbaceous layer is dominant it rarely exceeds 50% cover. Related Concepts: ALLIANCE DESCRIPTION Environment: Stands of this alliance are widely distributed along the northern and western margins of the Great Basin, from southwestern Idaho to northeastern California. Elevations range from under 200 m along the Columbia River in central Washington to over 1500 m in California. Throughout the range the climate is semi-arid, with 23-36 cm of precipitation annually, and a maximum in winter. The temperature regime is cool summer-continental, with a wide range in diurnal temperatures and night frosts through most of the year. Summer lightning storms and associated fire are common in the environments where this type occurs and are presumably important in structuring the vegetation. Generally soils are medium-textured, with abundant coarse fragments, and derived from volcanic parent materials. In central Oregon, the center of its range, vegetation of this alliance is found on all aspects and slope positions. Contiguous vegetation is most commonly Pinus ponderosa forests or Juniperus occidentalis woodlands and Artemisia steppe at the wetter and drier margins, respectively. Vegetation: Vegetation within this alliance is usually characterized by a sparse overstory of Juniperus occidentalis. Cercocarpus ledifolius, a tall shrub or small tree, may also be common. Other shrubs which commonly occur in these woodlands are Purshia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), Chrysothamnus viscidiflorus, Ribes cereum, and Artemisia rigida, Artemisia arbuscula or Artemisia tridentata. More commonly, this alliance is characterized by a well-developed herbaceous layer of perennial bunch grasses. The herbaceous layer is usually comprised of annual and perennial grasses such as Pseudoroegneria spicata, Festuca idahoensis, Poa secunda, Koeleria macrantha, and Stipa spp. Common forbs include Achillea millefolium, Balsamorhiza spp., and Trifolium macrocephalum. Dynamics: Juniperus occidentalis has been documented to germinate and grow preferentially under the canopy of Artemisia and other shrubs (Everett 1986), and is currently expanding its range into surrounding steppe vegetation types. Burkhardt and Tisdale (1969) noted that larger, older trees are often associated with rock outcrops, while younger trees are prevalent on adjacent alluvial soils. This pattern has also been observed in northeastern California (Barbour and Major 1977). This pattern has been interpreted to mean that Juniperus occidentalis colonizes from rocky refuges which offer shelter from fire, and that the recent expansion of these woodlands can be linked to fire suppression. In most stands of this alliance, individual trees are small, possibly indicating recent colonization of grassland habitats. ALLIANCE DISTRIBUTION Range: Vegetation within this alliance occurs along the northern and western edges of the Great Basin from northeastern California north to central Washington and east to southwestern Idaho. The areas of broadest distribution are central Oregon and the Modoc Plateau of northeastern California. Both areas lie just east of the Cascade Mountains and have extensive moderate elevation terrain with mild topography. This type is found west of the Cascade-Sierra axis in the upper Klamath Basin, where it occurs in the rain shadow of the Klamath Mountains. Vegetation within this alliance has a peripheral range relative to the Juniperus occidentalis Woodland Alliance (A.535), usually occurring on the drier edges of the woodland where trees are intermingling with or invading the surrounding steppe grasslands. Nations: US Subnations: CA, ID, NV?, OR, WA TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342C:CC, 342H:CC, 342I:CC, M242C:CC, M261G:CC, M332G:CC Federal Lands: ALLIANCE SOURCES References: Baker 1980b, Barrows et al. 1977, Burkhardt and Tisdale 1969, Copeland 1980b, Dealy 1978, Dealy et al. 1978, Driscoll 1964a, Driscoll 1964b, Eckert 1957, Everett 1986, Franklin et al. 1972, Hall 1973, Hall 1978, Hopkins 1979a, Johnson and Clausnitzer 1992, Johnson and Simon 1987, Kagan 1988, Moir et al. 1973b, Segura-Bustamante 1970, Volland 1976, Winward and Youtie 1976 CEGL001716–Juniperus occidentalis / Artemisia arbuscula / Festuca idahoensis Wooded Herbaceous VegetationWestern Juniper / Dwarf Sagebrush / Idaho Fescue Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 2 - Moderate Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia arbuscula/Festuca idahoensis (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: Version: ELEMENT GLOBAL RANK & REASONS GRank: G3? GRank Review Date: 1-Feb-1996 GReasons: Ranking Author: Version: ELEMENT DISTRIBUTION Range: Nations: US Subnations: CA:S2, ID:S3, OR:S3 TNC Ecoregions: 6:P USFS Ecoregions: M332G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll et al. 1984, Eckert 1957, Hall 1973, Hall 1978, Hopkins 1979a, Western Ecology Working Group n.d. CEGL001715–Juniperus occidentalis / Artemisia arbuscula / Poa secunda Wooded Herbaceous VegetationWestern Juniper / Dwarf Sagebrush / Curly Bluegrass Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 2 - Moderate Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: M.P. Murray Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: This association is known from the central Blue and Ochoco mountains, and from the Steens Mountains in the northern Great Basin. It occurs in shallow scablands where sufficient moisture and basalt cracks allow for the establishment of Juniperus occidentalis. Slopes are generally fairly flat (2-15%) at elevations of 4000-5800 feet. Soils are usually of igneous parent material (lava) of a sandy loam to loamy character. This is a savanna-like assemblage with Juniperus occidentalis occurring in open stands (less than 5% cover). Artemisia arbuscula cover is about 7-22%. Individual plants of this species are often concealed by surrounding bunch grasses. Poa secunda ranges between 4-20% cover, while Festuca idahoensis and Pseudoroegneria spicata range 0-40% and 0-50%, respectively. Poa secunda gains importance at lower slopes with concave topography and with heavy grazing. Classification Comments: Hall (1973) and Johnson and Clausnitzer (1992) describe a Juniperus occidentalis - Artemisia arbuscula association that is equivalent to this. Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis - Artemisia arbuscula (Hall 1973) = Juniperus occidentalis - Artemisia arbuscula (Johnson and Clausnitzer 1992) = Juniperus occidentalis/Artemisia arbuscula/Poa secunda (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: M.P. Murray Version: 26-Nov-1997 ELEMENT GLOBAL RANK & REASONS GRank: G2 GRank Review Date: 29-Mar-1999 GReasons: This is a very rare, and very restricted type. It occurs in shallow scablands where sufficient moisture and basalt cracks allow for the establishment of Juniperus occidentalis. Most known occurrences are very small (2-10 ha). There about 20-25 sites known, so overall area for this community is very limited. There are no known protected occurrences. The junipers which dominate most sites are extremely old. However, threats to most sites are fairly limited. Grazing and fire exclusion may lead to an increase in juniper establishment. Ranking Author: M.P. Murray Version: 22-Mar-1999 ELEMENT DISTRIBUTION Range: This association is known from the central Blue and Ochoco mountains, and from the Steens Mountains in the northern Great Basin. While not described, it might occur in extreme northeastern California or along the northern Nevada border. Nations: US Subnations: CA?, OR:S2 TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342C:CC, 342H:CC, M332G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll et al. 1984, Hall 1973, Hall 1978, Johnson and Clausnitzer 1992, Western Ecology Working Group n.d. CEGL001717–Juniperus occidentalis / Artemisia arbuscula / Pseudoroegneria spicata Wooded Herbaceous VegetationWestern Juniper / Dwarf Sagebrush / Bluebunch Wheatgrass Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 1 - Strong Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia arbuscula/Pseudoroegneria spicata (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: Version: ELEMENT GLOBAL RANK & REASONS GRank: G3G4 GRank Review Date: 1-Feb-1996 GReasons: Ranking Author: Version: ELEMENT DISTRIBUTION Range: Nations: US Subnations: CA?, OR:S3S4 TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342C:CC, 342H:CC, M332G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll et al. 1984, Eckert 1957, Hall 1973, Hall 1978, Hopkins 1979a, Western Ecology Working Group n.d. CEGL001718–Juniperus occidentalis / Artemisia rigida / Poa secunda Wooded Herbaceous VegetationWestern Juniper / Scabland Sagebrush / Curly Bluegrass Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 1 - Strong Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: J. Titus Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: In this association Juniperus occidentalis trees have low cover and are scattered across the landscape and Artemisia rigida cover ranges from 4-15% with low apparentness. However, in poor condition sites Artemisia rigida cover increases to more than 25%. Purshia tridentata occurs occasionally. Poa secunda is the dominant grass. Other common herbs include Festuca idahoensis and Pseudoroegneria spicata. On lower quality sites the non-native grass Bromus tectorum is dominant. This association occurs on substrates of lava, sedimentary and granitic origins in central and northeastern Oregon. Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia rigida/Poa secunda (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: J. Titus Version: 26-Nov-1997 ELEMENT GLOBAL RANK & REASONS GRank: G2G3 GRank Review Date: 30-Nov-1998 GReasons: This association occurs in scattered locations across central and northeastern Oregon. The environmental conditions necessary for the occurrence of this association are not that rare. However, grazing has greatly decreased the extent of this association, some stands have been lost due to other forms of agricultural development. Even light grazing destroys the cryptogamic crust and leads to invasion by non-native species. Ranking Author: J. Titus Version: 11-Sep-1998 ELEMENT DISTRIBUTION Range: This association is found in central and northeastern Oregon. Nations: US Subnations: OR:S2S3 TNC Ecoregions: 6:C USFS Ecoregions: 342B:C?, 342C:CC, 342H:CC, M332G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll et al. 1984, Hall 1973, Hall 1978, Western Ecology Working Group n.d. CEGL001722–Juniperus occidentalis / Artemisia tridentata - Purshia tridentata Wooded Herbaceous VegetationWestern Juniper / Basin Big Sagebrush - Bitterbrush Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 2 - Moderate Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia tridentata-Purshia tridentata (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: Version: ELEMENT GLOBAL RANK & REASONS GRank: G4Q GRank Review Date: 1-Feb-1996 GReasons: Ranking Author: Version: ELEMENT DISTRIBUTION Range: Nations: US Subnations: CA?, OR:S4 TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342C:CC, 342H:CC, M261G:CC, M332G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll 1964a, Driscoll 1964b, Driscoll et al. 1984, Segura-Bustamante 1970, Volland 1976, Western Ecology Working Group n.d. CEGL001719–Juniperus occidentalis / Artemisia tridentata / Carex filifolia Wooded Herbaceous VegetationWestern Juniper / Basin Big Sagebrush / Threadleaf Sedge Wooded Herbaceous Vegetation Western Juniper / Big Sagebrush / Threadleaf Sedge Classif. Resp.: West Classif. Level: Association Conf.: 1 - Strong Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: M.S. Reid, mod. J. Titus Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: Juniperus occidentalis is the dominant tree in this old-growth, relatively open woodland. There is a shrub-steppe type understory which is dominated by Artemisia tridentata ssp. wyomingensis with Purshia tridentata as an occasional associate. Grasses dominate the forb layer, with Carex filifolia composing more than half of this cover. Other common associates include Pseudoroegneria spicata, Festuca idahoensis, Koeleria macrantha, Elymus elymoides, Eriogonum microthecum, and Tetradymia canescens. Areas in good condition have high cover of mosses, especially under the Juniperus occidentalis trees. Elevation ranges from 1250-1430 m. The community is located on a broad ridgetop to plateau of rolling topography, although most occurrences are on north-facing slopes. Most precipitation occurs as snow, summers are warm and dry with 1-4 months without rain. Soils are sandy-textured and developed in 30-60 cm of aerially deposited pumice over well-cracked Columbia basalt bedrock. Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia tridentata/Carex filifolia (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: This association occurs within the western juniper zone of central Oregon, which is the most xeric of the tree-dominated regions of the Pacific Northwest. Average annual precipitation in this region is from 8 to 13 inches, with most occurring as snow during the cool winter. Summers are hot and dry. The association occurs from 4100 to 4700 feet elevation on the rolling topography of a ridge which rises above the surrounding plateau. Because of its higher elevation, this ridge receives slightly higher annual and summer precipitation than other areas within the western juniper zone. Columbia River basalts underlie the region. Soils are derived from 12 to 24 inches of aerially deposited pumice over well-cracked basalt bedrock. Textures are sandy loams, organic matter is low, and lower portions of the profiles often have white calcareous or siliceous deposits. The soil surface is bare of litter and is covered by fine pumice gravel. Vegetation: This is a wooded grassland (savanna) association, with a moderately sparse tree layer and a sparse shrub layer. The tree layer consists of an open canopy of the needle-leaved evergreen Juniperus occidentalis, with cover between 10% and 25%. Seedlings and saplings are present. The shrub layer is dominated by the microphyllous evergreen Artemisia tridentata, with occasional associated species such as Purshia tridentata, Tetradymia glabrata and Chrysothamnus viscidiflorus. Total shrub cover is less than 20%. The herbaceous layer is dominated by the perennial sedge Carex filifolia and the bunchgrass Festuca idahoensis. Other perennial grasses commonly present include Pseudoroegneria spicata, Elymus elymoides, Koeleria macrantha, and Achnatherum thurberianum (= Stipa thurberiana). Common perennial forbs include Packera cana (= Senecio canus), Erigeron filifolius, Astragalus curvicarpus, and the suffrutescent Eriogonum umbellatum. The annual forbs Collinsia parviflora and Linanthus septentrionalis are also commonly present. Total herbaceous cover is greater than 25%, but the average is not known. Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Western juniper appears to affect distribution of other plant species. For example, within the root and crown zone of junipers, Festuca idahoensis becomes dominant, to the near exclusion of Artemisia tridentata and Carex filifolia. The latter species is apparently sensitive to grazing; the dominance of it on the Horse Ridge RNA is an indication of minimal livestock disturbance on this site. Description Author: M.S. Reid, mod. J. Titus Version: 28-Sep-1993 ELEMENT GLOBAL RANK & REASONS GRank: G1 GRank Review Date: 30-Nov-1998 GReasons: The range of this association is limited, restricted to a small area in and around Horse Ridge Natural Research Area southeast of Bend, in the High Lava Plains section of the Columbia Plateau ecoregion. This type probably was never widespread. It has declined as a result of some recent development, and overgrazing has degraded some areas, but it is almost as widespread now as it has ever been. Although a large percentage of the area occupied by this association is in the Horse Ridge Research Natural Area, the small area and small number of EOs makes this association a G1. Cattle grazing (which is allowed on BLM RNAs) and ORV use threaten this association. Ranking Author: J. Titus Version: 2-Oct-1998 ELEMENT DISTRIBUTION Range: The range of this association is limited, restricted to a small area in and around Horse Ridge Natural Research Area southeast of Bend, in the High Lava Plains section of the Columbia Plateau ecoregion. Nations: US Subnations: OR:S1 TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342H:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll et al. 1984, Franklin and Dyrness 1973, Franklin et al. 1972, Western Ecology Working Group n.d. CEGL001720–Juniperus occidentalis / Artemisia tridentata / Festuca idahoensis Wooded Herbaceous VegetationWestern Juniper / Basin Big Sagebrush / Idaho Fescue Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 1 - Strong Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia tridentata/Festuca idahoensis (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: Version: ELEMENT GLOBAL RANK & REASONS GRank: G3 GRank Review Date: 1-Feb-1996 GReasons: Ranking Author: Version: ELEMENT DISTRIBUTION Range: Nations: US Subnations: CA?, OR:S3, WA:S1 TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342H:CC, 342I:CC, M242C:CC, M261G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Driscoll 1964a, Driscoll et al. 1984, Eckert 1957, Hall 1973, Hall 1978, Hopkins 1979a, Western Ecology Working Group n.d. CEGL001721–Juniperus occidentalis / Artemisia tridentata / Pseudoroegneria spicata Wooded Herbaceous VegetationWestern Juniper / Basin Big Sagebrush / Bluebunch Wheatgrass Wooded Herbaceous Vegetation Classif. Resp.: West Classif. Level: Association Conf.: 1 - Strong Stakeholders: West Status: Standard Origin: 26-Nov-1997 Concept Auth.: Concept Ref.: Western Ecology Working Group n.d. Ecological Systems: Columbia Plateau Western Juniper Woodland and Savanna (CES304.082) ELEMENT CONCEPT Summary: Classification Comments: Similar Associations: Similar Association Comments: Related Concepts: Juniperus occidentalis/Artemisia tridentata/Pseudoroegneria spicata (Bourgeron and Engelking 1994) = DRISCOLL FORMATION CODE:V.C.1.d. (Driscoll et al. 1984) B ELEMENT DESCRIPTION Environment: Vegetation: Dynamics: Adjacent Associations: Adjacent Association Comments: Other Comments: Description Author: Version: ELEMENT GLOBAL RANK & REASONS GRank: G3G4 GRank Review Date: 1-Feb-1996 GReasons: Ranking Author: Version: ELEMENT DISTRIBUTION Range: Nations: US Subnations: CA?, OR:S3 TNC Ecoregions: 6:C USFS Ecoregions: 342B:CC, 342H:CC, M242C:CC, M261G:CC, M332G:CC Federal Lands: ELEMENT SOURCES References: Bourgeron and Engelking 1994, Dealy 1978, Driscoll 1964a, Driscoll et al. 1984, Eckert 1957, Hall 1973, Hopkins 1979a, Western Ecology Working Group n.d. 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