Cladistic analysis and revision of Dalechampia sections Rhopalostylis and Brevicolumnae (Euphorbiaceae)

Three new species of Dalechampia are described. Two are placed in section Rhopalostylis and the third is placed in a new section Brevicolumnae. The phylogenetic relationships among the species of the two sections and the species' relationships to members of other sections are estimated. Section Rhopalostylis appears to be paraphyletic, but recognition of additional sections is unwarranted at this time. Descriptions and key to the 10 species in the two sections are provided. Pollination biology, ecology, phenology, and distribution, when known, are given for each species.