Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park 37a Tidal marsh dominated by smooth cordgrass (Spartina alterniflora), typically less than 1 m tall; often in association with inland saltgrass (Distichlis spicata) and/or saltmeadow cordgrass (Spartina patens). .........................Tidal Mesohaline and Polyhaline Marsh (Low Salt Marsh) [Tidal Mesohaline and Polyhaline Marsh] 37b Tidal marsh dominated by smooth cordgrass (Spartina alterniflora) occurring with big cordgrass (Spartina cynosuroides) and green arrow arum (Peltandra virginica); often as linear bands along tidal channels. ..................................................... Tidal Mesohaline and Polyhaline Marsh (Transitional Marsh) [Tidal Mesohaline and Polyhaline Marsh] 38a Tidal marsh dominated by annual wild rice (Zizania aquatica var. aquatica) or green arrow arum (Peltandra virginica), pickerelweed (Pontederia cordata), or dotted smartweed (Polygonum punctatum). ...... Tidal Freshwater Marsh 38b Tidal marsh dominated by big cordgrass (Spartina cynosuroides), narrowleaf cattail (Typha angustifolia), or common reed (Phragmites australis); associates can include chairmaker's bulrush (Schoenoplectus americanus), crimsoneyed rosemallow (Hibiscus moscheutos ssp. moscheutos), and others. ................................................................................................................. 39 39a Tidal marsh dominated by common reed (Phragmites australis); typically monospecific stands with few associates. ............................................................................................ ................... Tidal Oligohaline Marsh (Common Reed Tidal Marsh) [Tidal Oligohaline Marsh] 39b Tidal marsh dominated by big cordgrass (Spartina cynosuroides), narrowleaf cattail (Typha angustifolia), or various species of bulrushes (Schoenoplectus spp.) with or without other associates. ................................................................................................................. 40 40a Tidal marsh strongly dominated by big cordgrass (Spartina cynosuroides); may have patch dominance by green arrow arum (Peltandra virginica). ........................................................................................................................... ................................. Tidal Oligohaline Marsh (Big Cordgrass Type) [Tidal Oligohaline Marsh] 40b Tidal marsh dominated by grasses and/or forbs with variable dominance by narrowleaf cattail (Typha angustifolia), chairmaker's bulrush (Schoenoplectus americanus), common threesquare (Schoenoplectus pungens var. pugens), or softstem bulrush (Schoenoplectus tabernaemontani), or with no clear dominant. ..................................................... 41 41a Tidal marsh dominated by mixtures of the tidal forbs narrow leaf cattail (Typha angustifolia), dotted smartweed (Polygonum punctatum), green arrow arum (Peltandra virginica), crimsoneyed rosemallow (Hibiscus moscheutos ssp. moscheutos), and others. ............................................................................................................... .................................... Tidal Oligohaline Marsh (Mixed Forbs Type) [Tidal Oligohaline Marsh] 41b Tidal marsh located within the interior of another marsh type, well away from tidal channels and sometimes in depressions; dominated by the tidal grasses chairmaker's bulrush (Schoenoplectus americanus), common threesquare (Schoenoplectus pungens var. pungens), or softstem bulrush (Schoenoplectus tabernaemontani), sometimes with saltmeadow cordgrass (Spartina patens). ............................................................................................................................ 42 366
USGS-NPS Vegetation Mapping Program Colonial National Historical Park 42a Interior tidal marsh away from tidal channels; on spongy, organic substrate and dominated by chairmaker's bulrush (Schoenoplectus americanus) with saltmeadow cordgrass (Spartina patens). ................................................................ ..................................... Tidal Oligohaline Marsh (Saltmeadow Cordgrass - Olney Three-Square Low Interior Marsh Type) [Tidal Oligohaline Marsh] 42b Interior tidal marsh on small depressions or mudflats with common threesquare (Schoenoplectus pungens var. pungens) or softstem bulrush (Schoenoplectus tabernaemontani) and other species. .................................................................................................... ..................... Tidal Oligohaline Marsh (Interior Depression Marsh) [Tidal Oligohaline Marsh] 367
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Vegetation Classification and Mapping Project Report - USGS

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