Nomenclatural notes on species of Apocynaceae described from Cambodia, Laos and Vietnam Author Middleton, David J. Author Regalado J, Jacinto C. text Adansonia 2005 3 27 2 291 308 journal article http://doi.org/10.5281/zenodo.5186636 1639-4798 5186636 Chonemorpha megacalyx Pierre ex Spire Contr. Apocyn.: 76 (1905). LECTOTYPE . — Spire 17 ( P ), Laos , Xieng Khouang , Tran Ninh, designated here.