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A.343 | EcoArt 2002
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Name: A.343
Reference: EcoArt 2002
Description: These communities occur in low-elevation (0-500 m) wetland habitats of the Puget Trough and Willamette Valley of western Oregon and Washington, typically in poorly drained swales or riparian areas. Flooding occurs in much of the winter, spring, and occasionally into early summer. Scour associated with flooding is common, but not necessary to maintain these communities. These are the typical forests of older fluvial sites, such as oxbow lakes. Soils are usually silts or clays with poor drainage and gleying is evident. These forests are dominated by ~Fraxinus latifolia$ in the tree canopy, usually as the only tree species. Towards the drier edges of a stand, ~Acer macrophyllum$ or ~Quercus garryana$ may occur in small amounts. In stands near active stream channels with mineral soils, ~Alnus rubra, Alnus rhombifolia, Populus balsamifera ssp. trichocarpa$, and ~Salix$ spp. may be common. Understory shrubs are not common, but when present species may include ~Crataegus douglasii, Spiraea douglasii, Symphoricarpos albus, Rosa eglanteria$, and ~Rubus ursinus$. The herbaceous layer is dominated by the perennial graminoid ~Carex obnupta$; other graminoids that may be present include ~Carex deweyana, Carex unilateralis, Carex ovalis (= Carex leporina)$, and ~Eleocharis acicularis$. Common forbs include ~Galium trifidum, Galium aparine, Ranunculus uncinatus, Veronica$ spp., and ~Geum macrophyllum$. Adjacent vegetation is most often upland forest of ~Quercus garryana$ and wet prairie dominated by ~Deschampsia caespitosa$ and/or ~Hordeum brachyantherum$. 
Accession Code: VB.CC.1968.A343
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Nov-1997 to: 17-Mar-2005
     
  • status: accepted
  • Community's Parent: I.B.2.N.e
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: FRAXINUS LATIFOLIA SEASONALLY FLOODED FOREST ALLIANCE
  Code: A.343
  Common: Oregon Ash Seasonally Flooded Forest Alliance
(convergence) and Synonyms:
(undetermined) Fraxinus latifolia Seasonally Flooded Forest Alliance