Vascular Plant Checklists from Oklahoma

A bibliography of 85 references involving Oklahoma flora is provided, 52 of which provide a vascular plant species list from an unambiguous area. I list geographic, topographic, and taxonomic summary data for 59 floras (some references provide multiple lists). The species-area relationship for Oklahoma (with a z value of 0.15) is similar to that of North America as a whole. In the face of imminent climate change, thepace of floristic research in Oklahoma needs to accelerate.