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F 3  seeds from a cross of  P .  erosus  (indeterminate, daylength sensitive) X  P .  ahipa  (determinate, daylength insensitive) were received from M. Sorensen of the Royal Veterinary and Agricultural University in Copenhagen, Denmark and sown in Hawaii in April, 1989 to increase the seed. The F 4  seed were planted in March, 1990 and in October, 1990 (the normal time). All F 4  progeny included both bush and vine plants in the summer planting, with more bush plants in the progeny of F 3  bushes than vines. Likewise, the progeny of earlier-flowering F 3  plants had a higher percentage of plants in flower in June than progeny of later-flowering ones. Root sizes and shapes were variable. The F 4  progenies of the lines with the highest percentage of bushes and early-flowering plants were regrown in the summer of 1991 and selected for summer-flowering bush plants with acceptable root size. The selections were then grown in the winter of 1991 to test for performance during the normal growing season.

VARIABILITY AND SELECTION IN AN INTERSPECIFIC HYBRID POPULATION OF PACHYRRHIZUS EROSUS X P. AHIPA (YAM BEAN)