Monographs Details: Odontadenia cognata (Stadelm.) Woodson
Authority: Maguire, Bassett & Wurdack, John J. 1958. The botany of the Guayana Highland--Part III. Mem. New York Bot. Gard. 10: 1-156.
Family:Apocynaceae
Description:Distribution and Ecology - Amazonas: Maguire & Politi 28627, Cerro Sipapo (Paraque), mixed montane forest, trail from Base Camp, Jan 25, 1949, liana, flowers yellow. Maguirc, Wurdaclc & Bunting 36331, Rio Guainia, frequent, in sabanita along Yavita-Pimichin trail near Pimichin, 120-140 m elev., Nov 22, 1953, woody vine in low trees, flowers yellowr marked with orange in throat.

Discussion:The corolla of 28627 is much less puberulent than usual, but the indumentum is variable in density in the flowers of the same collection. The calyx-lobes are up to 8 mm long, the calyx-lobes of 36331 are up to 6 mm long. It is doubtful that O. cognata is specifically different from O. verrucosa (R. & S.) K. Sch. ex Mgf. The difference between the two seems to be a trivial one in calyx size. O. sprucei (Muell.-Arg.) K Seh., placed in the synonymy of O. verrucosa by Woodson, has the stamens (isotype at NYBG) inserted at the base of the corollathroat, where the tube begins to dilate; this character would refer the species to 0. puneticulosa (A. Rich.) Pulle in Woodson's treatment. 0. boliviano Rusby (Mem. Torrey Club 6: 76. 1896. Type: Bang 1687, Tipuani-Guanai), which was overlooked by Woodson, also seems to belong with 0. puneticulosa.
Distribution:Venezuela South America|