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Capparaceae and Brassicaceae have long been known to be closely related families, with the monophyly of Capparaceae more recently questioned. To elucidate the relationship between Brassicaceae and Capparaceae as well as to address infrafamilial relationships within Capparaceae, we analyzed sequence variation for a large sampling, especially of Capparaceae, of these two families using two chloroplast regions, trnLtrnF and ndhF. Results of parsimony and likelihood analyses strongly support the monophyly of Brassicaceae plus Capparaceae, excluding Forchhammeria, which is clearly placed outside the Brassicaceae and Capparaceae clade and suggest the recognition of three primary clades—Capparaceae subfamily (subf.) Capparoideae, subf. Cleomoideae, and Brassicaceae. Capparaceae monophyly is strongly contradicted with Cleomoideae appearing as sister to Brassicaceae. Two traditionally …