A revision of Celtis subg. Mertensia (Ulmaceae)

摘要

A revision of the neotropical subgenusMertensia of the ulmaceous genusCeltis is presented. This group is a clear-cut entity characterized by the presence of thorns and/or domatia, as well subspecies and varieties have been recognized. In the present treatment the number of species is reduced to six, including a new and thornless species,C. loxensis. Descriptions of the subgenus and species, a key to species, a list of synonyms, and distribution data are presented.