Leaf anatomical characters of Rhabdadenia (Rhabdadenieae, Apocynaceae), their taxonomic implications, and notes on the presence of articulated laticifers in the genus. - Pirolla-Souza, Andressa; O. Arruda, Rosani C.; Pace, Marcelo R.; Farinaccio, Maria A. (Plant Systematics & Evolution, 2019)