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 Melodinus oblongus Pierre ex Spire Contr. Apocyn.: 121 (1905). LECTOTYPE . — Spire 51 ( HM ), Laos , Xieng Khouang , designated by L´y, Feddes Repert. 97: 418 (1986) . Second step lectotypification, designated here (there were two undifferentiated specimens of Spire 51 at HM).