Abstract
These data support the research article: "Non-native species threaten the biotic integrity of the largest remnant Pacific Northwest Bunchgrass prairie in the United States" Endress et al. (2019) [1].The data were collected at the Zumwalt Prairie Preserve (Zumwalt), northeastern Oregon, USA, and include vascular plant species abundance matrices from 123 plots sampled in 2008 and 2009 and the estimated abundance of dominant species in community space.