1967. The morphology of the dormant embryo and young seedling of 

 five species of Dioscorea from Nigeria. Proc. Linn. Soc. Lond. 

 178: 153-159. 



(17) Martin, F. W., and Ortiz, S. 



1963. Chromosome numbers and behavior in some species of Dioscorea. 

 Cytologia 28: 96-101. 



(18) , and Ruberte, R. 



1972. Yam {Dioscorea spp.) for production of chips and french fries. 

 J. Agric. Univ. P.R. 56 : 228-234. 



(19) , and Ruberte, R. 



1975. Carotenoid pigments of Dioscorea cayenensis. Ann. Appl. Biol. 

 30:317-322. 



(20) Miege, J. 



1954. Nombres chromosomiques et repartition geographique de quelque 

 plantes tropicales et equatoriales. Rev. Cytol. Biol. Veg. 15: 

 327-344. 



(21) 



1968. Dioscoreaceae. In Flora of Tropical West Africa, 2d ed., pp. 

 144-154. 



(22) Ogundana, S. K. 



1972. The control of soft rot of yams in Nigeria. Int. Biodeterior. Bull. 

 8: 75-78. 



(23) Onwueme, I. C. 



1973. The sprouting process in yam (Dioscorea spp.) tuber pieces. 

 J. Agric. Sci. 81 : 375-379. 



(24) Rasper, V.-, and Coursey, D. G. 



1967. Properties of starches of some West African yams. J. Sci. 

 Food Agric. 18: 240-244. 



(25) Rivera, J. R., Gonzalez, M. A., Collazo de Rivera, A., and Cuevas-Ruiz, J. 



1974. An improved method for storing yam {Dioscorea alata) . J. 

 Agric. Univ. P.R. 58: 456-465. 



(26) Ruppel, E. G., Delpln, H., and Martin, F. W. 



1966. Preliminary studies of a virus disease of sapogenin-producing 

 Dioscorea species in Puerto Rico. J. Agric. Univ. P.R. 50: 151- 

 157. 



(27) Sadik, S., and Okereke, 0. U. 



1975. Flov^rering, pollen grain germination, fruiting, seed germination, 

 and seedling development of w^hite yam, Dioscorea rotundata 

 Poir. Ann. Bot. 34: 597-604. 



(28) , and Okereke, 0. U. 



1975. A new approach to improvement of yam. Nature (Lond.) 254: 

 134-135. 



(29) Waitt, A. W. 



1965. A key to some Nigerian varieties of yam {Dioscorea spp.). 

 Niger. Fed. Rep. Agric. Res. Memo. 60, 127 pp. 



(30) Wholey, D. W., and Haynes, P. H. 



1971. A yam staking system for Trinidad. World Crops, May/June, 



pp. 123-126. SMITHSONIAN INSTITUTION LIBRARIES 



nhbot SB211.Y3M379 

 pt. 4 I ropical yams and their potential 



36 



