Maximum clade credibility tree for Xylopia. Tree obtained from Bayesian analysis of the four-marker data set for 44 Xylopia species, from Stull et al. (2017), showing geographic distribution, major clades, and relationship of named sections. Species of the first diverging subclade of the Stenoxylopia clade, X. mwasumbii, X. lukei, and X. sp. aff. sahafariensis, are placed in this revision into a new section, sect. Verdcourtia. Figure reproduced with permission of the American Society of Plant Taxonomists.