BioStor
 | Some clarifications, new species, and new combinations in American Cynanchinae (Asclepiadaceae) S Liede and U Meve (1997) Novon 7: 38-45 |
 | Taxonomic changes in American Metastelminae (Apocynaceae--Asclepiadoideae) S Liede and U Meve (2001) Novon 11: 171-182 |