"THE END OF AN ENIGMA", A NEW SUBTRIBE AND NOMENCLATURAL NOVELTIES IN ASCLEPIADEAE (APOCYNACEAE: ASCLEPIADOIDEAE).

A new name, Topea H. A. Keller, is proposed for the genus Aenigma H. A. Keller (Apocynaceae) because there is a preexisting phonetic homonym. In addition, based on molecular phylogenetic studies, the new, monogeneric subtribe Topeinae H. A. Keller & Liede, endemic to the southern cone of South America, is here described within the tribe Asclepiadeae. [ABSTRACT FROM AUTHOR]