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Pinus ponderosa / Purshia tridentata / Achnatherum occidentale Woodland | Western Ecology Working Group of...
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Name: Pinus ponderosa / Purshia tridentata / Achnatherum occidentale Woodland Reference: Western Ecology Working Group of... Description: This is an open woodland found on pumice or ash in the East Cascades and Modoc Plateau in southern Oregon and northern California. Oregon sites are associated with Mount Mazama pumice. California sites are from the Medicine Lake Highlands. This association developed with frequent, low intensity fire, although most stands have been excluded from fire for the last 80 years. With fire, these stands were probably more open and park-like, and had much lower shrub cover. Most stands are on flats and sideslopes, with an average slope of only 8%. The upper elevational range is 1720 m. In California it occurs down to 1460 m, in Oregon down to 860 m, probably because pumice occurs at lower elevations in Oregon. The community was described from 31 plots over a 100-km range in Oregon, and from 6 plots from northern California. However, very few remnants of this community are left with old-growth Pinus ponderosa trees. Pinus ponderosa is generally the only tree found in the overstory and understory. In a few Oregon stands (especially those which have been disturbed), Pinus contorta can also be found. Tree cover ranges from 5-40%. Purshia tridentata is the dominant shrub, always present and averaging about 15% cover. Other shrubs include Ericameria bloomeri (= Haplopappus bloomeri), Ribes cereum, and Arctostaphylos patula. Achnatherum occidentale (= Stipa occidentalis) dominates good condition stands, although with grazing, Elymus elymoides becomes more important. Other forbs include Penstemon cinicola, Eriogonum nudum, Hieracium scouleri, and Carex rossii. This type is easily distinguished by the dominants, and its occurrence on pumice.  Accession Code: VB.CC.18838.PINUSPONDEROSAP Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Pinus ponderosa Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Ponderosa Pine / Bitterbrush / Western Needlegrass Woodland   UID: ELEMENT_GLOBAL.2.683981 NatureServe Explorer   Code: CEGL000198   Scientific: Pinus ponderosa / Purshia tridentata / Achnatherum occidentale Woodland (convergence) and Synonyms: (undetermined) Pinus ponderosa / Purshia tridentata / Achnatherum occidentale Woodland