Abes Run wetland is a biologically diverse, 82-ac (33-ha) complex of wet meadow, marsh, scrub-shrub, and forested-swamp communities in Canaan Valley, WV. In 2002, we sampled the vegetation in six 65-ft (20-m)-wide transects and identified a total of 179 vascular plant species. We classified 23 species as introduced; 38 occurred at or near the southernmost known limit of their range. Two graminoid-dominated (e.g., Carex spp. [sedges], Leersia spp. [cutgrass], and Scirpus spp. [bulrush]) and forb-dominated (Euthamia spp. [goldenrods]) transects occurred in an area that had been forested and later inundated by Castor canadensis (North American Beaver) in the 1970s. Four transects were mixed-deciduous and coniferous forested-swamp communities. With the exception of transect 5, these sites had an organic horizon that was 32–40-in (80–100-cm) deep in the center, and the water table tended to persist at the wetland surface through the first half of the growing season. The tree stratum was well-developed, although discontinuous, and was dominated by mixtures of Fraxinus nigra (Black Ash), Abies balsamea (Balsam Fir), Picea rubens (Red Spruce), and Betula alleghaniensis (Yellow Birch). A rich shrub layer of Rhamnus alnifolia (Alder-leaved Buckthorn), Ilex verticillata (Winterberry), and Alnus incana ssp. rugosa (Speckled Alder) was also present. The broken overstory created a variable light regime on the wetland floor and as a consequence, there was high diversity of herbaceous plants. Although a rank comparison of 1945 vs. 1997 vegetative-cover classes did not yield any significant differences, we noted 3 trends: 1) North American Beaver activities reduced the area of coniferous swamp forests, 2) wet-graminoid areas increased as beaver dams were abandoned and their impoundments dried, and 3) the extent of scrub-shrub communities increased, particularly in the upper portions of the wetland's drainage.