Useful links:

Maryland Plants:
Recommended Native Plants for Maryland
Center for Coastal Resources Management

Tidal Wetland and Beach / Dune PlantsPlants in this list can be used for marsh plantings or to stabilize tidal brackish or saltwater shorelines based on salinity and wetness tolerances. Check the salinity and moisture requirements for each plant so they will be planted in the appropriate conditions. Those species for use in salinity greater than 15 ppt are marked (*). (pdf version)
Low Marsh HerbaceousJuncus roemerianus *
Black needlerush

Peltandra virginica
Arrow arum

Pontedaria cordata
Pickerelweed

Spartina alterniflora *
Saltmarsh cordgrass

Spartina cynosuroides
Big cordgrass

Schoenoplectus (Scirpus) pungens
Three-square

Schoenoplectus (Scirpus) robustus *
Saltmarsh bulrush

Schoenoplectus (Scirpus) validus
Giant bulrush

High Marsh ShrubsBaccharis halimifolia *
Groundsel bush

Iva frutescens *
Marsh elder

Morella (Myrica) cerifera *
Wax myrtle

Morella (Myrica) pensylvanica *
Northern bayberry

Beach/Dune HerbaceousAmmophila breviligulata *
American beachgrass

Panicum amarum *
Bitter panicum

Panicum virgatum *
Switch grass

Uniola paniculata *
Sea oats
* salinity greater than 15 ppt
Useful Plant Links

• USDA Plants Database
  
• Native Plants for Wildlife Habitat and Conservation Landscaping: Chesapeake Bay Watershed, USFWS, 2005
  
• Native Plants for Conservation, Restoration, and Landscaping: Coastal Plain, VADCR, 2001