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Crataegus douglasii / Symphoricarpos albus Wet Shrubland Alliance | NatureServe Biotics 2019
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Name: Crataegus douglasii / Symphoricarpos albus Wet Shrubland Alliance Reference: NatureServe Biotics 2019 Description: The shrub canopy of this deciduous broad-leaved shrubland alliance is dominated by <i>Crataegus douglasii</i>, often forming dense thickets. Occasional the broad-leaved deciduous trees <i>Populus tremuloides</i> or <i>Populus balsamifera ssp. trichocarpa</i> may codominate the tree layer for a period of years before dying back from heart rot. Other trees are occasionally present with low cover. The understory is dominated by short shrubs or herbaceous species. Common shrubs include <i>Rosa nutkana, Rosa woodsii, Spiraea betulifolia</i>, and <i>Symphoricarpos albus</i>. The sparse to moderately dense herbaceous layer is composed of perennial graminoids, such as <i>Deschampsia cespitosa, Elymus glaucus</i>, and <i>Leymus cinereus</i>, and diverse forbs The herbaceous layer is relatively depauperate if <i>Heracleum maximum</i> is abundant due to the extreme shading. Many weedy introduced grasses are common, such as the perennial forage species <i>Bromus inermis, Phleum pratense, Poa pratensis</i>, and invasive annual grass <i>Bromus tectorum</i>. This alliance is found in the lower montane and foothill regions around the Columbia Basin, and north and east into the Central Rockies in Idaho and northwestern Wyoming. Stands occur on relatively moist sites on deep soils within flat valleys on low-gradient streams with broad floodplains that flood seasonally. Elevations range between 400 and 850 m. Stands often extend up adjacent north-facing toeslopes where seepage provides constant moisture. Soils are typically deep and fine-textured.  Accession Code: urn:lsid:vegbank.org:commConcept:39184-{C0F1DDF8-3DA4-4BD5-802B-B149B682787F} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 14-Mar-2014 to: ongoing
	status: accepted Community's Parent: Salix spp. - Alnus spp. - Betula occidentalis Riparian & Seep Shrubland Group This Community's Level: Alliance This Community's Children: Show/Hide   Crataegus douglasii / Rosa woodsii Wet Shrubland   (Populus tremuloides) / Crataegus douglasii / Heracleum maximum Wet Shrubland   (Populus tremuloides) / Crataegus douglasii / Symphoricarpos albus Wet Shrubland		Names:   UID: ELEMENT_GLOBAL.2.900025 NatureServe Explorer   Code: A3974   Translated: Black Hawthorn / Common Snowberry Wet Shrubland Alliance   Common: Valley Bottom Black Hawthorn / Common Snowberry Wet Shrubland   Scientific: Crataegus douglasii / Symphoricarpos albus Wet Shrubland Alliance