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Glyceria grandis Wet Meadow | NatureServe Biotics 2019
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Name: Glyceria grandis Wet Meadow Reference: NatureServe Biotics 2019 Description: This association most commonly occurs in the mountains of southeastern Oregon, across southern Idaho, and western Montana at elevations ranging from 1340 to 2715 m (4400-8900 feet). The association occurs in narrow to broad V-shaped valleys with 5-6% gradients. It occupies low-lying bars and streamside terraces with silty, slightly acidic soils of saturated alluvium or poorly drained Histosols, Mollisols, and Entisols. The association is also found on the margins of ponds and reservoirs, and in seasonally flooded wet meadows on floodplains of low-gradient streams, springs, sloughs, and ditches. Some occurrences are saturated season-long, while some occurrences are found adjacent to more dynamic fluvial systems that are inundated early in the season. The water table is high and is at or above the soil surface during summer. This association occurs as a very small patch (less than 0.5 acre) but can occupy as much as an entire acre. Stands are distinctively dominated by <i>Glyceria grandis</i>, up to 2 m tall, with an average cover of 30-90%. Other graminoids with high constancy and low cover include <i>Agrostis stolonifera</i> (introduced), <i>Carex athrostachya, Carex vesicaria, Juncus arcticus ssp. littoralis</i>, other <i>Juncus</i> spp., and <i>Eleocharis</i> spp. A variety of forbs that tolerate saturated moisture conditions occur with low cover, including <i>Epilobium</i> spp., <i>Mimulus guttatus, Montia chamissoi, Rumex crispus</i>, and <i>Veronica americana</i>.  Accession Code: urn:lsid:vegbank.org:commConcept:32311-{A1D0FA4B-C21A-4AAF-8F18-FA2902A6447F} Plot-observations of this Community Concept: 1
	Party Perspective according to: NatureServe (organization) Perspective from: 13-Jan-2005 to: ongoing
	status: accepted Community's Parent: Glyceria grandis - Glyceria striata - Glyceria borealis Wet Meadow Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.684685 NatureServe Explorer   Code: CEGL003429   Translated: American Mannagrass Wet Meadow   Scientific: Glyceria grandis Wet Meadow (convergence) and Synonyms: (similar) CEGL003429 (similar) Glyceria grandis Herbaceous Vegetation (similar) Glyceria grandis Herbaceous Vegetation