Résumé
Two neotropical species of the Alibertia group (Gardenieae-Rubiaceae) are described and illustrated. Cordiera longicaudata C. Persson & Delprete sp. nov. occurs in Panama and northwestern Ecuador (Awa Reserve) and is characterized by its long drip tips and glabrous to minutely puberulent corollas. Duroia valesca C. Persson & Delprete sp. nov. is from the Atlantic forest of Brazil (states of Espirito Santo and Minas Gerais) and is distinguished by its heteromorphic calyx lobes that are large, 13-15 x 7-8 mm, elliptic and contorted in female flowers, whereas the calyx lobes of the male flowers are 3-5 x 1-2 mm and narrowly triangular.