@article {33, title = {Les esp{\`e}ces africaines du genre Psychotria L. (Rubiaceae) - I}, journal = {Bulletin du Jardin Botanique de l{\textquoteright}{\'E}tat, Bruxelles}, volume = {34}, year = {1964}, pages = {1-229}, chapter = {1}, author = {Petit, E.} } @article {34, title = {Les esp{\`e}ces africaines du genre Psychotria L. (Rubiaceae)}, journal = {Bulletin du Jardin Botanique de l{\textquoteright}{\'E}tat, Bruxelles}, volume = {34}, year = {1964}, pages = {1-229}, author = {Petit, E.} } @article {35, title = {Les esp{\`e}ces africaines du genre Psychotria L. (Rubiaceae) - II}, journal = {Bulletin du Jardin Botanique de l{\textquoteright}{\'E}tat, Bruxelles}, volume = {36}, year = {1966}, pages = {65-190}, chapter = {65}, author = {Petit, E.} }