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A.1359 | EcoArt 2002
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Name: A.1359 Reference: EcoArt 2002 Description: This alliance occurs in the interior valleys of western Oregon. Proximity to the Pacific Coast is modified by the coastal mountain ranges to the west. Elevation ranges from 49-137 m. Winters are mild and wet, but summers are hot and dry. Persistent, low-intensity winter rains result in soil saturation and flooding of low-lying valley bottoms. These flat-bottomed valleys are underlain with deep alluvial materials, over which silts and clays have been deposited. Topographically, there are broad, alluvial flats separated by groups of low hills with slow-flowing and meandering rivers. Stands occur in old valley bottom river oxbows or bottomland swamp and lake remnants. The soils are heavy clays overlain by silt or silt loam. The deep clay horizons result in high water-holding capacity and poor drainage. The sites are temporarily flooded, but typically dry out from late July to early October. The vegetation is characterized by a dense perennial graminoid layer. ~Carex unilateralis$, a non-rhizomatous sedge, is always present to dominant, and ~Hordeum brachyantherum$ is also important. Several other sedge species are common and occasionally abundant, including ~Carex obnupta, Carex lasiocarpa, Carex utriculata$, and ~Carex pellita (= Carex lanuginosa)$. Several other perennial graminoids can be important, such as ~Juncus balticus, Juncus acuminatus, Juncus oxymeris$, and ~Juncus tenuis$. The bunchgrass ~Deschampsia caespitosa$ is occasionally present, but is never dominant. A few forbs are present in small amounts, including ~Mentha arvensis, Prunella vulgaris, Veronica$ spp., and ~Ranunculus$ spp. Diagnostic of this herbaceous alliance is the presence of ~Carex unilateralis$ in these wetlands that are flooded during the winter and early in the growing season.  Accession Code: VB.CC.1133.A1359 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: V.A.5.N.j This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: CAREX UNILATERALIS TEMPORARILY FLOODED HERBACEOUS ALLIANCE   Code: A.1359   Common: One-sided Sedge Temporarily Flooded Herbaceous Alliance (convergence) and Synonyms: (undetermined) Carex unilateralis Temporarily Flooded Herbaceous Alliance