Beginning the fall of 1967 the author and his students made collections of vascular plants for a contribution to the Flora of Virginia. The collections are for the Fall Belt counties of Fairfax and Arlington and the nearby cities of Alexandria, Fairfax, Falls Church, and the Town of Vienna. Included in the collections are 321 taxa not reported from these counties by Massey (1961) and six of these taxa are apparently new to the state. Voucher specimens are deposited in the George Mason College herbarium and many duplicates are deposited in the herbarium of the Virginia Polytechnic Institute.