@ARTICLE {UGBOROGHO:1993, title = {The relevance of stomatal frequency, type and size in the delimitation of three complex species of Dioscorea L. (Dioscoreaceae)}, author = {Ugborogho, R. E. and Ng, N. Q. and Thottappilly, G. and Hahn, S. K. }, journal = {Feddes Repertorium}, year = {1993}, volume = {104}, number = {7-8}, pages = {485--496}, }