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A.342 | EcoArt 2002
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Name: A.342
Reference: EcoArt 2002
Description: This alliance occurs throughout the northern Puget Trough lowlands and in low-lying valleys near the Oregon and northern California coasts. It typically occurs along low-elevation (0-1000 m) streams or valley bottoms, along the upland margins of wetlands, or on the floodplains of streams and rivers. Soils range from alluvium to veneers of muck and peat. These forests are seasonally flooded by spring snowmelt and rains, and the soils may be saturated year-round in some stands. ~Alnus rubra$ is well-adapted to wet soil conditions and is highly shade-intolerant. Communities within this alliance are usually strongly dominated by ~Alnus rubra$, which forms a diffuse canopy. Cover of ~Alnus$ ranges from 40-80%. The forest undergrowth is usually dominated by a deciduous shrub layer, in which ~Rubus spectabilis$ can be the only species. Cover of ~Rubus spectabilis$ ranges from 30-60%. The herbaceous layer may be well-developed, with species such as ~Athyrium filix-femina, Equisetum hyemale, Galium trifidum, Lonicera involucrata, Lysichiton americanus, Rubus ursinus, Tiarella trifoliata$, and ~Tolmiea menziesii$?. 
Accession Code: VB.CC.1967.A342
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: ALNUS RUBRA SEASONALLY FLOODED FOREST ALLIANCE
  Code: A.342
  Common: Red Alder Seasonally Flooded Forest Alliance
(convergence) and Synonyms:
(undetermined) Alnus rubra Seasonally Flooded Forest Alliance