Additions to the Vascular Flora of the George Washington Memorial Parkway, Virginia, Maryland, and the District of Columbia
Banisteria, Number 37, pages 3-20 © 2011 Virginia Natural History Society Additions to the Vascular Flora of the George Washington Memorial Parkway, Virginia, Maryland, and the District of Columbia Brent W. Steury 700 George Washington Memorial Parkway Turkey Run Park Headquarters McLean, Virginia 22101 ABSTRACT A total of 298 taxa new to the vascular flora of the George Washington Memorial Parkway (GWMP), in Virginia, Maryland, and the District of Columbia, are documented. Additionally, 13 taxa previously known only from historical specimens are documented as still extant within GWMP. These records bring the known flora of the GWMP to 1313 taxa. Of these, 79 are known only from historical specimens. Seventeen adventive taxa may represent the first records for the Commonwealth of Virginia, and one is a first record for the District of Columbia. A total of 21 additional taxa are first records for Fairfax County and six are new records for Arlington County. Fifteen of the newly documented taxa are listed as rare within the Commonwealth, bringing the total to 37 state-rare plants found within GWMP. Taxa non-native to the District of Columbia and vicinity comprise 28.6% of the flora. Key words: Arlington County, biodiversity, District of Columbia, Fairfax County, flora, George Washington Memorial Parkway, Maryland, Montgomery County, National Park, vascular plants, Virginia. INTRODUCTION Falls Park, while other non-native species included on historical planting plans for GWMP have apparently The only published floras for National Park Service remained benign. In addition to naturally established sites found within the George Washington Memorial vegetation, this inventory attempted to include all Parkway (GWMP) are from the 323 ha Great Falls Park woody species planted within the GWMP and to assess (Grimshaw & Bradley, 1973; Steury et al., 2008).
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