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Ludwigia palustris - Polygonum hydropiperoides Aquatic Vegetation | NatureServe Biotics 2019
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Name: Ludwigia palustris - Polygonum hydropiperoides Aquatic Vegetation Reference: NatureServe Biotics 2019 Description: Habitat of this herbaceous vegetation of Oregon and Washington is seasonally flooded eutrophic lakes, ponds, and sloughs at low elevations (3-152 m [10-500 feet]). This association forms extensive stands in shallow seasonal lakes and ponds on floodplains and deflation plains, subject to drying in summer. Soils are seasonally flooded to moist mostly silt loam, some organic. It is more common in interior valleys on <i>Fraxinus latifolia</i> floodplains but occurs sporadically along the coast. <i>Salix lucida ssp. lasiandra</i> is the only tree or shrub present, but it has low constancy and cover because of extensive seasonal ponding. <i>Polygonum hydropiperoides</i> is the primary species with an average cover of 57% and ranges to 99%. It is not always present, and when absent the associated <i>Ludwigia palustris</i> is conspicuous. <i>Ludwigia</i> has a constancy of 63%, an average cover of 34%, and may range to 90%. Eighteen other species in the herb layer occur at low constancy and cover, except for significant patches of <i>Bidens cernua, Sagittaria latifolia</i>, or <i>Leersia oryzoides</i>. <i>Phalaris arundinacea</i> may also form patches but is inhibited by seasonal ponding. The association tolerates eutrophic conditions and flashy hydroperiods associated with urban and agricultural landscapes.  Accession Code: urn:lsid:vegbank.org:commConcept:32212-{AF5B9868-F904-4EAF-8E11-C2CBC5E14E1F} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 06-Apr-2012 to: ongoing
	status: accepted Community's Parent: Potamogeton natans - Polygonum amphibium Aquatic Vegetation Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.688338 NatureServe Explorer   Code: CEGL003330   Translated: Marsh Seedbox - Swamp Smartweed Aquatic Vegetation   Scientific: Ludwigia palustris - Polygonum hydropiperoides Aquatic Vegetation (convergence) and Synonyms: (similar) Ludwigia palustris - Polygonum hydropiperoides Herbaceous Vegetation