Updated List of Taxa for Vascular Plants of the Gypsum Hills and Redbed Plains Area of Southwestern Oklahoma

The following is a list of vascular plants of the redbed plains and gypsum areas of southwestern Oklahoma based on specimens collected by the author and deposited in the Oklahoma State Herbarium and the Bebb Herbarium of the University of Oklahoma. In addition, 26 taxa collected by previous workers and four observed, but not collected, are included and so indicated. Each taxon is listed alphabetically within its family and families are listed in order according to the Engler-Prantl classification scheme. Nomenclature originally followed that of Correll and Johnston (1970) and Waterfall (1969), but has been updated by Bruce Hoagland of the Oklahoma Biological Survey according to the National Plant Data Center, Baton Rouge, LA accessed January 2009.