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Polygonum amphibium - Sagittaria latifolia Riverine Wet Meadow | NatureServe Biotics 2019
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Name: Polygonum amphibium - Sagittaria latifolia Riverine Wet Meadow Reference: NatureServe Biotics 2019 Description: This association is currently only described from Mississippi National River and Recreation Area, Minnesota. Additional global information will be added as it becomes available. This forb-dominated wetland usually forms dense, low herbaceous stands. However, it occurs mostly in floodplains and is subject to periodic severe flooding which can kill some of the existing plants and open up the herbaceous canopy. In the absence of repeated disturbance, the herbaceous stratum fills in the open areas, first with annuals or short-lived perennials and eventually with perennials. Shrubs are not common but can have up to 25% cover in some stands. Trees are widely scattered or absent. <i>Polygonum amphibium</i> is the most common species in this community and can form nearly solid canopies 0.5-1 m high. <i>Sagittaria latifolia</i> and other low forbs can be abundant under this canopy. <i>Bolboschoenus fluviatilis</i> and <i>Sagittaria latifolia</i> are very common but do not have more than 50% cover. The perennials <i>Carex lacustris, Leersia oryzoides, Phalaris arundinacea, Phragmites australis, Sparganium eurycarpum, Stachys tenuifolia</i>, and <i>Typha</i> spp., and the annuals/biennials <i>Amaranthus tuberculatus, Bidens cernua, Bidens frondosa, Calystegia sepium, Eragrostis hypnoides, Polygonum pensylvanicum, Sicyos angulatus</i>, and <i>Xanthium strumarium</i> can all be found in this community. Woody species include <i>Salix interior</i> and small to large floodplain trees. This association is found along the Mississippi, Minnesota, and Vermillion rivers and some tributaries in areas protected from constant exposure to currents. This can include lakes or depressions in the floodplain as well as backwater areas of the main rivers. Stands are often flooded for a few to several weeks each year but will not persist in the face of repeated exposure to strong currents and deposition and scouring. Soil is rich fine-textured alluvium which can encourage lush vegetative growth.  Accession Code: urn:lsid:vegbank.org:commConcept:34217-{255B8402-6C26-417D-B341-175219415147} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 21-Aug-2018 to: ongoing
	status: accepted Community's Parent: Polygonum spp. Shoreline Wet Meadow Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.903087 NatureServe Explorer   Code: CEGL005458   Translated: Water Knotweed - Broadleaf Arrowhead Riverine Wet Meadow   Common: Riverine Forb Wet Meadow   Scientific: Polygonum amphibium - Sagittaria latifolia Riverine Wet Meadow (convergence) and Synonyms: (similar) Polygonum amphibium - Sagittaria latifolia Riverine Herbaceous Vegetation