Abstract
To identify the principal characters which account for the major variation among yellow yams, Dioscorea cayenensis Lam., for use in routine groupings, 20 accessions were studied using principal component analysis (PCA) with 49 characters. Based on PCA, six characters were chosen for constructing the metroglyph, whose groupings of accessions highly corresponded with those indicated by a PCA ordination on axes I, II and III. The main vegetative characters that distinguish between yellow yam accessions were: leaf retension in October, mean leaf area, size of tuber crown, leaf virus infection, plant leafiness, and fresh tuber yield. However, some accessions consistently failed to flower and can thus be easily differentiated.
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