A revisionary treatment of Brazoria is rendered. Three taxa are recognized: B. arenaria and B. truncata, the latter with two intergrading morphogeographical varieties: var. truncata and var. pulcherrinma (LUNDELL) M. W. TURNER, comb. nova. A fourth taxon, orignally described as B. scutellarioides, is separated as a new monotypic genus, Warnockia, resulting in the new combination Warnackia scutellarioides (ENGELM. & A. GRAY) M. W. TURNER. Descriptions, illustrations, a phylogenetic analysis, dot-maps, keys to species and complete synonymy are presented. The relationship of Warnockia to its most closely related genera, Brazoria, Physostegia and Macbridea, is discussed.
