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Juniperus occidentalis Open Woodland Group | NatureServe Biotics 2019
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Name: Juniperus occidentalis Open Woodland Group Reference: NatureServe Biotics 2019 Description: This woodland group is found on the Columbia Plateau and extends to the northern and western margins of the Great Basin, from southwestern Idaho, along the eastern foothills of the Cascades, south to the Modoc Plateau of northeastern California. <i>Juniperus occidentalis</i> is typically the only tree species with <i>Pinus monophylla</i> absent. <i>Pinus ponderosa</i> or <i>Pinus jeffreyi</i> may be present in higher elevation stands. The tree form of <i>Cercocarpus ledifolius</i> may occasionally codominate. In the understory, <i>Artemisia tridentata</i> is the most common shrub; others are <i>Cercocarpus ledifolius</i> (shrub form), <i>Chrysothamnus viscidiflorus, Ericameria nauseosa, Purshia tridentata, Ribes cereum</i>, and <i>Tetradymia</i> spp. Graminoids commonly include <i>Carex filifolia, Festuca idahoensis, Poa secunda</i>, and <i>Pseudoroegneria spicata</i>. This group occurs over a wide elevation range from under 200 m along the Columbia River in central Washington to over 1500 m in the Blue Mountains. In the middle of its distribution in central Oregon, stands occur on all aspects and slope positions. Older woodlands are generally found in rocky areas where fire frequency is low. Generally soils are medium-textured, with abundant coarse fragments, and derived from volcanic parent materials. Throughout much of its range, fire exclusion and removal of fine fuels by grazing livestock have reduced fire frequency and allowed <i>Juniperus occidentalis</i> seedlings to colonize adjacent alluvial soils and expand into the shrub-steppe and grasslands. <i>Juniperus occidentalis</i> savanna may occur on the drier edges of woodlands where trees are intermingling with or invading the surrounding grasslands and where local edaphic or climatic conditions favor grasslands over shrublands. Where this group grades into relatively mesic forest or grassland habitats, these woodlands become restricted to rock outcrops or escarpments with excessively drained soils.  Accession Code: urn:lsid:vegbank.org:commConcept:40029-{DCAC6C08-BC3F-4583-BBD1-FBC08518A132} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 09-Nov-2015 to: ongoing
	status: accepted Community's Parent: Pinus monophylla - Juniperus osteosperma - Juniperus occidentalis Intermountain Woodland Macrogroup This Community's Level: Group This Community's Children: Show/Hide   Juniperus occidentalis Grassy Open Woodland Alliance   Juniperus occidentalis Shrubby Woodland Alliance		Names:   UID: ELEMENT_GLOBAL.2.833247 NatureServe Explorer   Code: G248   Scientific: Juniperus occidentalis Open Woodland Group