Sensitive joint vetch (Aeschynomene virginica (L.) BSP.) (Carulli and Fairbrothers 1988, Isley 1990, Rudd 1955) is a Federally Threatened annual legume indigenous to tidal freshwater marshes of the eastern United States. The historic range was Pennsylvania, New Jersey, Delaware, Maryland, Virginia, and North Carolina (Schulz 1994). Plants have not been seen in Pennsylvania and Delaware since the late 1800s; only one population is extant in New Jersey; and North Carolina plants are restricted to roadside ditches and cornfields (Schulz 1994). In Virginia, six populations are distributed over four river systems (Schulz 1994). Current distribution and demographic information for A. virginica in Maryland is reported in this paper first for the portion of the coastal plain east of the Chesapeake Bay (Eastern Shore, lower coastal plain, Delmarva Peninsula) and then for the portion west of the Bay (Western Shore, upper coastal plain).