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Interspecific Hybridization in the Genus Phaseolus¹

Seven species of Phaseolus, namely P. Calcaratus, P. mungo, P. angularis, P. lunatus, P. acutifolius, and P. vulgaris, were interpolinated in all possible combinations. On the basis of pod development, three types of compatibility are suggested: Compatible crosses that yield mature hybrid seeds; partially compatible crosses where the pods collapse in the early stages of development: incompatible crosses that fail to develop pods. A compatible cross was P. vulgaris x P. coccineus. Partially compatible crosses were: P. vulgaris x P. acutifolius, P. acutifolius x P. coccineus, P. coccineus x P. acutifolius, P. vulgaris x P. mungo, P. mungo x P. calcaratus, P. vulgaris x P. lunatus, P. angularis x P. acutifolius, P. angularis x P. vulgaris, P. mungo x P. vulgaris, P. angularis x P. calcaratus, P. vulgaris x P. calcaratus, and P. angularis x P. mungo. The remaining combinations of species crosses were incompatible.

² Graduate Student and Associate Professor, respectively, Department of Horticulture and Forestry, University of Nebraska, Lincoln, Nebr.

Received for publication August 13, 1965.

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