136 



MEMOIRS t OF THE NEW YORK BOTANICAL GARDEN 



[vol. 10 



Type: Bassett Maguire, R. 8. Cowan &• John J. Wur clack 29488, Rio Cunu- 

 eunuma, Rio Orinoco, Amazonas, Venezuela, at landing, Playa Alta, Nov 9, 1950, 

 vine, flowers greenish, lower one-third of corolla pale pink (unicate, NY). 



M. acutisepala is characterized by the acute lobes of the calyx and the 

 straight wide-spreading secondary nerves. The only other known South Ameri- 

 can species with acute sepals is the Colombian M. citrifolia (H.B.K.) Woodson. 

 The leaf texture in M. acutisepala is thinner, the secondaries spread at a wider 

 angle and are not barbate at the axils, the tertiaries arc fainter, the leaf base is 

 not subcordate; the calyx is obviously much larger than that of M. citrifolia. 

 Our species more probably developed from the widely distributed variable M. 

 trifida (Jacq.) Muell.-Arg. ; it is easily distinguished from it by the acute calyx- 

 lobes and the more erect and straight secondary nerves. 



Microplumeria anomala (Muell.-Arg.) Mgf. 



Bolivar: Wurdack 4' Monachino 39902, drowned margins of Rio Horeda 1-4 km above 

 mouth, elev. 90 m, Dec 15, 1955, shrub 3 m, latex white, scanty, leaves mostly 3-whorled, some- 

 times opposite, flowers dull white. 



It is interesting to have discovered the genus in Venezuela. The type was 

 collected by Spruce near Manaos, Brazil. The species has also been collected in 

 the state of Para. The leaves of the Venezuelan plant are somewhat less nar- 

 rowed at base and apex, but the plant is surely this species. 



Odontadenia cognata (Stadelm.) Woods 



Amazonas: Maguire 4" Politi 28627, Cerro Sipapo (Paraque), mixed montane forest, trail 

 from Base Camp, Jan 25, 1949, liana, flowers yellow. Maguire, Wurdack 4' 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 yellow marked with orange in throat. 



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. 0. 

 sprucei (Muell.-Arg.) K Sch., placed in the synonymy of 0. verrucosa by Wood- 

 son, has the stamens (isotype at NYBG) inserted at the base of the corolla- 

 throat, where the tube begins to dilate ; this character would refer the species 

 to 0. puncticulosa (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. puncticulosa. 



Odontadenia funigera Woods. 



Amazonas: Maguire, Wurdack $ Bunting 36517, Casiquiare, occasional along Rio Yatua 

 above mouth of Rio Yacibo, 100-140 m elev., Dec 4, 1953, woody vine, floAvers yellow. 



The specimen was compared with an isotype which was collected at Manaos, 

 Brazil. The calyx-lobes are up to 6 mm long, eiliate, essentially glabrous in the 

 upper part; corolla almost glabrous outside, the throat up to 2.5 cm" in diameter 

 (pressed) ; stamens inserted below the dilation of the throat, the anthers hairy 

 dorsally; ovary sparsely hairy or glabrous; leaf-blades up to 17 cm long and 

 8 em broad. Tt remains to be seen what relationship this species holds with its 

 close allies which at present are mostly known from only single collections. 



Odontadenia glauca Woods. 



Amazonas: Maguire, Couan 4 s Wurdack 30580, Cerro Yapacana, Rio Orinoco, infrequent, 

 Savanna No. ?>, Jan 1, 1951, vine, flowers yellow. Maguire Wurdack 34568, Alto Rio Orinoco, 



