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Populus balsamifera ssp. trichocarpa / Crataegus douglasii Riparian Forest | NatureServe Biotics 2019
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Name: Populus balsamifera ssp. trichocarpa / Crataegus douglasii Riparian Forest Reference: NatureServe Biotics 2019 Description: This riparian forest association occurs along tributaries to the Grande Ronde River in the foothills zone of the Wallowa Mountains of northeastern Oregon. Stands may also occur in the adjacent regions of southeastern Washington and west-central Idaho along the smaller tributaries of the Snake and Grande Ronde rivers. These forests occur in riparian zones of moderate-sized streams and rivers. Soils are derived from stream-deposited alluvium and are shallow and rocky. Depth to the water table is usually less than 60 cm, and during spring averages 18 cm. The vegetation composition and structure of this association are poorly described, but it is apparently structurally diverse. The tree canopy is dominated by the broad-leaved deciduous <i>Populus balsamifera ssp. trichocarpa</i>, with the needle-leaved evergreen species <i>Abies grandis</i> and <i>Pinus ponderosa</i> occurring as scattered individuals. There is a tall-shrub layer composed primarily of the broad-leaved deciduous shrubs <i>Crataegus douglasii</i> and <i>Alnus incana</i>, the later primarily along the immediate streambanks. A shorter shrub layer dominated by <i>Rosa woodsii</i> may be present. The herbaceous layer is species-rich and abundant, often with a significant component of introduced species. Common native graminoids include <i>Elymus glaucus</i> and <i>Carex</i> spp.; forbs include <i>Osmorhiza berteroi, Ranunculus acris, Packera pseudaurea</i>, and <i>Claytonia perfoliata</i>. Introduced species often include <i>Poa pratensis, Dactylis glomerata</i>, and <i>Taraxacum officinale</i>. There is typically a cryptogamic layer. Diagnostic of this riparian forest association is the tree canopy dominated by <i>Populus balsamifera ssp. trichocarpa</i> with a <i>Crataegus douglasii</i>-codominated shrub layer. Sites have shallow water tables and are flooded for brief periods during the growing season.  Accession Code: urn:lsid:vegbank.org:commConcept:29582-{12D9E668-E833-4FF0-B805-E7A1A85A3569} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 02-Nov-1993 to: ongoing
	status: accepted Community's Parent: Populus balsamifera ssp. trichocarpa Northern Rocky Mountain Riparian Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.684059 NatureServe Explorer   Code: CEGL000673   Translated: Black Cottonwood / Black Hawthorn Riparian Forest   Scientific: Populus balsamifera ssp. trichocarpa / Crataegus douglasii Riparian Forest (convergence) and Synonyms: (similar) Populus balsamifera ssp. trichocarpa / Crataegus douglasii Forest (similar) Populus balsamifera ssp. trichocarpa / Crataegus douglasii Forest (similar) CEGL000673