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2. Aspects of the complex nodal anatomy of Dioscoreaceae;Ayensu E. S.;J. Arn. Arb.,1969
3. Analysis of the complex vascularity in stems of Dioscorea composita;Ayensu E. S.;J. Arn. Arb.,1970
4. Comparative anatomy of Dioscorea rotundata Poir. and Dioscorea cayenensis Lam;Ayensu E. S.;J. Linn. Soc. (Bot.),1970
5. Ayensu E. S. 1972 Anatomy of Monocotyledons. VI. Dioscoreales. New York.15–115.