Distributional data and taxonomic notes are presented for thirty-one taxa of the vascular flora of West Virginia. Ten of these are listed as rare or endangered. Two species are new to the state flora, Aster sagittifolius Wedemeyer and Puccinellia distans (Jacq.) Parl. The naturalization of the following non-indigenous species is discussed: Arthraxon hispidus (Thunb.) Makino; Lysimachia vulgaris L.; Lythrum salicaria L.; and Microstegium vimineum (Trin.) A. Camus. Suggestions are made for future revisions of the state list of rare species.