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Wetlands

Shrub Swamps and Shrub Riparian

Riparian wetland, John Day River, Wheeler County

Shrub swamps and shrub riparian
John Day River, Wheeler County
(John A. Christy, Oregon Biodiversity Information Center)

Shrub swamps and shrub riparian (see also Alkaline wetlands and Fens) occur along rivers and streams throughout the state and are often intermixed with upland portions of floodplains in a jumble of units that are difficult or impossible to map separately. Shrub swamps and shrub riparian are usually associated with seasonal flooding by streams and rivers along which they occur, but they may also be hydrated by perennial or seasonal seepage, tributary streams, or flooding caused by tidal cycles. Vegetation may be forested, scrub-shrub, or herbaceous, but is usually a mixture of alternating patches of all three different types. Historically, most riparian areas were grazed intensively by livestock, and severely degraded by soil compaction, denudation, downcutting of streams, and subsequent invasion by upland or exotic species. These impacts also degraded streams and caused problems for fish and other aquatic species. Over the last 20 years, extensive areas of riparian vegetation and hydrology have been restored by improved management practices.

Riparian Wetlands Map

Shrub swamps and shrub riparian map



Habitat: Edges of rivers, streams, lakes, and ponds; edges and interiors of peatlands; slopes, basins, and flats
Water regime: Perennially to seasonally flooded
Water chemistry: 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 Alnus incana / Athyrium filix-femina Shrubland
Mountain alder / lady fern
G3S2 BM
wetland type image Alnus incana / Calamagrostis canadensis Shrubland
Mountain alder / bluejoint reedgrass
G3S3 BM
wetland type image Alnus incana / Carex (aquatilis, deweyana, lenticularis, luzulina, pellita) Shrubland
Mountain alder / sedge
G3S3 BM
wetland type image Alnus incana / Cornus sericea Shrubland
Mountain alder / creek dogwood riparian
G3S3 BM, BR, EC
wetland type image Alnus incana / Equisetum arvense Shrubland
Mountain alder / common horsetail
G3S3 BM
wetland type image Alnus incana / Glyceria striata Shrubland
Mountain alder / fowl mannagrass
G3S3 BM
wetland type image Alnus incana / mesic forbs Shrubland
Mountain alder / mesic forbs
G3S3 BM
wetland type image Alnus incana / Ribes (inerme, hudsonianum, lacustre) Shrubland
Mountain alder / currant (white-stem gooseberry, stinking currant, swamp gooseberry)
G3S2 BM, EC
wetland type image Alnus incana / Scirpus microcarpus Shrubland
Mountain alder / smallfruited bulrush
G2S2 BM, EC, BR
wetland type image Alnus incana / Spiraea douglasii Shrubland
Mountain alder / Douglas spiraea
G3S2 BM, EC
wetland type image Alnus incana / Symphoricarpos albus Shrubland
Mountain alder / snowberry riparian
G3S2 BM, EC
wetland type image Alnus incana - Betula occidentalis Shrubland
Mountain alder-water birch
G2S1 BM, BR
wetland type image Alnus rhombifolia / Betula occidentalis Forest
White alder / water birch
G1S1 BM, BR, CP
wetland type image Alnus viridis ssp. sinuata / Acer circinatum Shrubland
Sitka alder / vine maple
G4S3 WC
wetland type image Alnus viridis ssp. sinuata / Athyrium filix-femina - Cinna latifolia Shrubland
Sitka alder/lady fern shrub - slender woodreed
G4S4 BM
wetland type image Alnus viridis ssp. sinuata / Oplopanax horridus Shrubland
Sitka alder / devils club
G4S4 BM, WC
wetland type image Alnus viridis ssp. sinuata / Rubus (lasiococcus, parviflorus) Shrubland
Sitka Alder / (dwarf bramble, thimbleberry)
G4S4 BM
wetland type image Betula glandulosa / Carex utriculata Shrubland
Dwarf birch / beaked sedge
G4S4 EC, WC
wetland type image Cornus sericea - Salix (hookeriana, sitchensis) Shrubland
Cornus sericea - Salix (hookeriana, sitchensis)
G3S3 CR, WV
wetland type image Dasiphora fruticosa ssp. floribunda / Deschampsia caespitosa ssp.Shrubland
Shrubby cinquefoil / tufted hairgrass
G4S2 BM
wetland type image Kalmia microphylla / Carex nigricasn Dwarf-shrubland
Small-leaved bog laurel / black alpine sedge
G3S2 BM, BR
wetland type image Kalmia microphylla / Carex scopulorum Dwarf-shrubland
Bog laurel / Holm sedge
G3S3 BM
wetland type image Malus fusca Shrubland
Oregon crabapple shrub-swamp
G3S3 CR, WV
wetland type image Ribes lacustre - Ribes hudsonianum / Cinna latifolia Shrubland
Prickly currant - black currant / slender woodreed
G2S2 BM
wetland type image Ribes lacustre - Ribes hudsonianum / Glyceria striata Shrubland
Prickly currant - black currant / fowl mannagrass
G2S2 BM
wetland type image Rosa nutkana / Deschampsia caespitosa Shrubland [Provisional]
Nootka rose / tufted hairgrass
G2S2 WV
wetland type image Rosa nutkana / Oenanthe sarmentosa Shrubland [Provisional]
Nootka rose / water parsley shrub swamp
G2S2 WV
wetland type image Salix amygdaloides - Salix exigua Woodland
Peachleaf willow - narrow-leaved willow
G1S1 CP, BM
wetland type image Salix boothii - Salix eastwoodiae / Carex nigricans Shrubland
Booth willow - mountain willow / black alpine sedge
G3S2 EC, BM
wetland type image Salix boothii - Salix lemmonii Shrubland
Booth willow - Lemmon willow
G3S2 EC, BM
wetland type image Salix boothii / Calamagrostis canadensis Shrubland
Booth willow / bluejoint reedgrass
G3S3 BM
wetland type image Salix boothii / Carex utriculata Shrubland
Booth willow / beaked sedge
G4S3 BM, EC
wetland type image Salix boothii / mesic forbs Shrubland
Booth willow / mesic forbs
G3S3 BM, EC
wetland type image Salix (boothii, geyeriana) / Carex aquatilis Shrubland
Willow (Booth willow, Geyer willow) / aquatic sedge
G3S3 BM, EC
wetland type image Salix boothii - Salix geyeriana / Carex angustata Shrubland
Booth willow - Geyer willow / widefruit sedge
G2S2 EC
wetland type image Salix commutata / Carex scopulorum Shrubland
Undergreen willow / Holm sedge
G3S3 BM, EC
wetland type image Salix drummondiana / Carex scopulorum var. prionophylla Shrubland
Drummond willow / Holm sedge
G2S2 BM
wetland type image Salix drummondiana / mesic forbs Shrubland
Drummond willow
G4S1 BM, BR
wetland type image Salix exigua / barren Shrubland
Narrow-leaved willow riparian
G5S4 BM, BR, CP, EC
wetland type image Salix eriocephala - Salix exigua Shrubland [Provisional]
Rigid willow - narrow-leaved willow
G3S2 BM, BR
wetland type image Salix exigua - Salix lucida ssp. caudata Shrubland
Coyote willow - greenleaf willow
G2S2 BM, BR, CP, EC
wetland type image Salix exigua / Equisetum arvense Shrubland
Coyote willow / common horsetail
G3S2 BM, BR, CP, EC
wetland type image Salix geyeriana - Salix eriocephala Shrubland
Geyer willow - rigid willow
G3S1 BR, CP
wetland type image Salix geyeriana - Salix lemmonii / Carex aquatilis var. dives Shrubland
Geyer willow - Lemmon willow / Sitka sedge
G3S2 EC
wetland type image Salix geyeriana / Calamagrostis canadensis Shrubland
Geyer willow / bluejoint reedgrass
G5S3 BM, EC
wetland type image Salix geyeriana / Carex utriculata Shrubland
Geyer willow / beaked sedge
G5S3 BM, EC
wetland type image Salix geyeriana / mesic forbs Shrubland
Geyer willow / mesic forbs
G3S3 BM, EC
wetland type image Salix geyeriana - Salix hookeriana Shrubland
Geyer willow - Hooker willow
G1S1 WC, WV
wetland type image Salix (hookeriana, sitchensis) - Spiraea douglasii Shrubland
Willow (Hooker willow, Sitka willow) - Douglas spiraea
G3S3 CR, WV
wetland type image Salix hookeriana - (Malus fusca) / Carex obnupta - Lysichiton americanus Shrubland
Hooker willow - (Oregon crabapple) / slough sedge - yellow skunk cabbage
G3S3 CR
wetland type image Salix hookeriana - Morella californica Shrubland
Hooker willow - Pacific waxmyrtle
G4S4 CR
wetland type image Salix hookeriana / Argentina egedii - Carex obnupta Shrubland [Provisional]
Hooker willow / Pacific silverweed - slough sedge
G4S4 CR
wetland type image Salix lutea / Carex utriculata Shrubland
Rigid willow / beaked sedge
G4S2 BR
wetland type image Salix (melanopsis, sitchensis) Cobble Bar Shrubland
Willow (dusky willow, Sitka Willow)
G3S3 BM
wetland type image Salix melanopsis Shrubland
Dusky willow
G3S2 BM, BR
wetland type image Salix sitchensis Shrubland
Sitka willow
G4S4 WV
wetland type image Spiraea douglasii Shrubland
Douglas spiraea shrub swamp
G5S4 CR, EC, WC, WV
wetland type image Spiraea douglasii / Sphagnum spp. Shrubland
Douglas spiraea / sphagnum
G3S1 WV

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

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