Abstract
The results of attempted hybridization between European species of large-grained species of Lupinus, L. albus, L. angustifolius and L. luteus and between these and the South American species L. mutabilis are described. Pollen-tube growth in interspecific combinations differed significantly from those after self-pollination only when L. luteus was the female parent. All combinations involving L. mutabilis pollen exhibited unilateral compatible pollen-tube growth. Substantial evidence of ovule stimulation and enhanced pod retention was recorded in crosses between the European species and L. mutabilis, but viable seeds were not obtained. The indications, from pollen-tube growth and pod retention in certain crosses, are that genetical isolation between some of the species could be overcome.
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