The vascular flora of Cove Point Marsh, a barrier wetland in Calvert County, Maryland, was surveyed from April 1996 to October 1997. A total of 304 species representing 305 varieties and one hybrid from 208 genera in 90 families were recorded from at least 10 community alliances in the study site. Of the 304 vascular taxa collected, 192 were principally associated with the wetland and 112 were primarily associated with the barrier dune. Of these, only 3.1% of the wetland taxa but 35.7% of the barrier dune/ beach taxa were not native to Maryland. At least 21 taxa were common to both the wetland and barrier dune habitats. Thirteen of the documented taxa were state listed as threatened or endangered and two of the plant community alliances were first reports for Maryland.