@article {3,
	title = {Classification of the Apocynaceae. XXV. Echitoideae and supplement to the Plumeroideae.},
	journal = {Memoires du Museum National d{\textquoteright}Histoire Naturelle, Paris Ser. B. Botanique},
	volume = {1},
	year = {1950},
	pages = {1{\textendash}170},
	author = {Pichon, Marcel and others}
}
