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Wetlands

Forested Wetlands

Cottonwood floodplain forest, Sand Island, Multnomah County

Cottonwood floodplain forest, Sand Island, Multnomah County
(John A. Christy, PSU Oregon Biodiversity Information Center)

Forested wetlands (see also Fens and Serpentine fens) are sometimes called swamps, and occur on seasonally or perennially wet flats, depressions, or stream terraces. Hydration may originate from precipitation, groundwater discharge, or inflowing streams. Forested wetlands sometimes occur within riparian zones but differ from riparian wetlands in their higher water tables and longer duration of surface water. Forested wetlands are typically flooded for several weeks during the growing season (seasonal flooding), and are differentiated from riparian stands that may have surface water for only a few days during a flood (temporary flooding).

Forested Wetlands Map

Forested Wetlands Map

Habitat: Edges of rivers, streams, lakes and ponds, edges and interiors of peatlands, or larger expanses in basins and flats
Water regime: Perennially to seasonally flooded
Water chemistry: Brackish or fresh

Ecoregion*: BM = Blue Mountains, BR = Northern Basin and Range, CB = Columbia Basin, CR = Coast Range, EC = East Cascades, KM = Klamath Mountains, WC = West Cascades, WV = Willamette Valley  
  Scientific & Common Name Global & State Rank Ecoregion*
wetland type image Abies amabilis / Oplopanax horridus Forest
Pacific silver fir / devil's club
G5S4 CR, WC
wetland type image Abies grandis / Trautvetteria caroliniensis Forest
Grand fir / false bugbane
G3S3 BM
wetland type image Abies grandis / Athyrium filix-femina Forest
Grand fir / lady fern riparian
G3S3 BM
wetland type image Abies grandis / Senecio triangularis Forest
Grand fir / arrowleaf groundsel
G3S3 BM, EC
wetland type image Abies lasiocarpa / Carex aquatilis var. aquatilis Forest
Subalpine fir / aquatic sedge
G4S4 BM
wetland type image Abies lasiocarpa / Trautvetteria caroliniensis Forest
Subalpine fir / false bugbane
G3S3 BM
wetland type image Abies lasiocarpa - Picea engelmannii / Calamagrostis canadensis Forest
Subalpine fir - Engelmann spruce / bluejoint reedgrass
G5S4 BM, EC
wetland type image Abies lasiocarpa / Senecio triangularis Forest [Provisional]
Subalpine fir / arrowleaf groundsel
G4S3 BM, EC
wetland type image Alnus rubra / Athyrium filix-femina - Asarum caudatum Forest
Red Alder / Lady fern - Wild Ginger
G1S1 BM
wetland type image Alnus rubra / Athyrium filix-femina - Lysichiton americanus Forest
Red alder / lady fern - yellow skunk cabbage
G3S3 CR, WC, WV
wetland type image Alnus rubra / Oxalis (oregana, trilliifolia) Forest
Red alder / (Oregon oxalis, trillium-leaved oxalis)
G4S4 CR, WC, WV
wetland type image Alnus rubra / Rubus spectabilis Forest
Red alder / salmonberry
G4S4 CR, WC, WV
wetland type image Alnus rubra / Rubus spectabilis / Carex obnupta - Lysichiton americanus
Red alder / salmonberry / slough sedge-yellow skunk cabbage
G3S3 CR, WC, WV
wetland type image Chamaecyparis nootkatensis / Oplopanax horridus Forest
Alaska yellow cedar / devils club swamp
G3S2 WC
wetland type image Fraxinus latifolia / Carex obnupta Forest
Oregon ash / slough sedge swamp
G4S4 WV
wetland type image Fraxinus latifolia / Juncus patens Forest
Oregon ash / spreading rush swamp
G2S2 KM, WV
wetland type image Fraxinus latifolia / Spiraea douglasii Forest
Oregon ash / Douglas spiraea riparian
G3S3 WV
wetland type image Fraxinus latifolia - (Populus balsamifera ssp. trichocarpa) / Cornus sericea
Oregon ash (black cottonwood) / creek dogwood
G4S4 CR, WV
wetland type image Fraxinus latifolia - Populus balsamifera ssp. trichocarpa / Rubus spectabilis Forest
Oregon ash-black cottonwood / salmonberry riparian
G2S2 WV
wetland type image Picea engelmannii / Carex angustata Forest
Engelmann spruce / widefruit sedge
G3S3 EC
wetland type image Picea engelmannii / Carex disperma Forest
Engelmann spruce / softleaf sedge
G3S2 BM, EC
wetland type image Picea engelmannii / Cornus sericea Woodland
Engelmann spruce / creek dogwood
G3S2 BM
wetland type image Picea engelmannii / Equisetum arvense Forest
Engelmann spruce / field horsetail
G4S3 BM, EC
wetland type image Picea engelmannii / Senecio triangularis Forest
Engelmann spruce / arrowleaf groundsel
G3S3 BM, EC
wetland type image Picea engelmannii / Vaccinium uliginosum Forest
Engelmann spruce / western bog blueberry
G3S3 BM, EC
wetland type image Picea sitchensis / Carex obnupta - Lysichiton americanus Forest
Sitka spruce / slough sedge - yellow skunk cabbage swamp
G2S1 CR
wetland type image Picea sitchensis / Cornus sericea / Lysichiton americanus Forest
Sitka spruce / creek dogwood - yellow skunk cabbage
G2S1 CR
wetland type image Picea sitchensis / Oplopanax horridus Giant Forest
Sitka spruce / devil's club - skunk cabbage
G4S3 CR
wetland type image Pinus contorta var. contorta / Carex obnupta
Shore pine / slough sedge swamp
G2S1 CR
wetland type image Pinus contorta var. latifolia / Calamagrostis canadensis Forest
Lodgepole pine / bluejoint
G5S3 BM, EC
wetland type image Pinus contorta var. latifolia / Carex (aquatilis var. aquatilis, angustata) Woodland
Lodgepole pine / (aquatic sedge, widefruit sedge)
G4S3 EC, BM
wetland type image Pinus contorta var. latifolia / Deschampsia caespitosa Forest
Lodgepole pine / tufted hairgrass
G3S3 BM, EC
wetland type image Pinus contorta var. latifolia / Vaccinium uliginosum Forest
Lodgepole pine / bog blueberry woodland
G3S3 EC, WC
wetland type image Pinus contorta var. latifolia / Spiraea douglasii Forest
Lodgpole pine / Douglas spiraea
G3S3 EC
wetland type image Pinus contorta ssp. latifolia - Populus tremuloides / Spiraea douglasii Forest
Lodgpole pine - quaking aspen / Douglas spiraea
G3S3 EC
wetland type image Populus angustifolia / Alnus incana Woodland
Narrowleaf cottonwood / mountain alder
G3S1 BR
wetland type image Populus angustifolia / Cornus sericea Woodland
Narrowleaf cottonwood / creek dogwood
G4S1 BR
wetland type image Populus balsamifera ssp. trichocarpa / Alnus incana Forest
Black cottonwood / mountain alder
G3S2 BM, BR, EC
wetland type image Populus balsamifera ssp. trichocarpa / Carex agustata Forest [Provisional]
Black cottonwood / widefruit sedge
G3S3 EC
wetland type image Populus balsamifera ssp. trichocarpa / Cornus sericea Forest
Black cottonwood / creek dogwood
G3S3 BM, BR, CP, EC
wetland type image Populus balsamifera ssp. trichocarpa / Cornus sericea / Lysichiton americanus Forest
Black cottonwood / creek dogwood / yellow skunk cabbage
G1S1 CR, WV
wetland type image Populus balsamifera ssp. trichocarpa / Crataegus douglasii Forest
Black cottonwood / Douglas spiraea
G1S1 BM, CP, EC
wetland type image Populus balsamifera ssp. trichocarpa / Salix exigua Forest
Black cottonwood / narrow-leaved willow
G1S1 BM, BR, CP
wetland type image Populus balsamifera ssp. trichocarpa / Salix lucida ssp. caudata Woodland
Black cottonwood / greenleaf willow
G2S2 BM
wetland type image Populus balsamifera ssp. trichocarpa / Salix spp. Woodland
Black cottonwood / willow
G4S2 BM, BR, CP
wetland type image Populus tremuloides / Alnus incana - Betula nana - Ribes spp.>Forest
Quaking aspen / mountain alder - bog birch - currant
G1S1 BM
wetland type image Populus tremuloides / Alnus incana - Salix spp. Forest
Quaking aspen / mountain alder - willow
G1S1 BM
wetland type image Populus tremuloides / Calamagrostis canadensis Forest
Quaking aspen / bluejoint reedgrass
G3S3 BM, EC
wetland type image Populus tremuloides / Carex aquatilis var. aquatilis Forest
Quaking aspen / aquatic sedge
G1S1 BM, CP
wetland type image Populus tremuloides / Carex obnupta Forest
Quaking aspen / slough sedge
G2S1 WV
wetland type image Populus tremuloides / Carex pellita Forest
Quaking aspen / woolly sedge
G2S2 BM, BR, EC
wetland type image Populus tremuloides / Cornus sericea Forest
Quaking aspen / creek dogwood
G4S3 BM, BR, CP, EC
wetland type image Salix lucida ssp. lasiandra / Urtica dioica ssp. gracilis Woodland
Pacific willow / American stinging nettle
G2S2 WV
wetland type image Thuja plicata / Athyrium filix-femina Forest
Western red cedar / common lady fern
G3S2 WC
wetland type image Thuja plicata - Tsuga heterophylla / Lysichiton americanus Forest
Western red cedar - western hemlock / yellow skunk cabbage
G3S1 CR, WC, WV
wetland type image Thuja plicata - Tsuga heterophylla / Oplopanax horridus Rocky Mountain Forest
Western red cedar - western red cedar / devils club
G3S1 BM
wetland type image Tsuga heterophylla / Acer circinatum / Lysichiton americanus Forest
Western hemlock / vine maple / yellow skunk cabbage swamp
G4S4 CR, EC, WC

Authored by John A. Christy, Wetlands Ecologist, (ORBIC) Oregon Biodiversity Information Center (2012)

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