Phylogenetics of the supertribe Paulliniodae (Sapindaceae) with emphasis on chromosome evolution: taxonomic implications including the new genus <i>Pacevedoa</i>

We propose the new genus Acevedoa, which is defined by a unique set of character states, including two corniculiform nectaries in the form of arched horns, calyx pentamerous, fruit trigonous turbinate, three winged, with remarkable stipe, relatively large sculptured seeds and 2n = 14. The following two new combinations are made to incorporate the results of our findings: Acevedoa heringeri and Acevedoa integerrima. Descriptions and illustrations are provided, with comments on geographical distribution, phenology, conservation status and generic relationships. The lectotype for the name belonging to Cardiospermum integerrimum is designated. A key to the genera of Paullinieae is added. The new genus, supported by morphological, chromosomal and molecular evidence, adds new features and extends knowledge on the supertribe Paulliniodae.