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