Abstract
Meiosis was studied in W. floribunda, varieties macrobotrys, alba and rosea, W. sinensis, W. venusta, W. macrostachya, and W. frutescens var. alba. All species and varieties showed [chi]=8. W. venusta was featured by polycary, polyspory, and pollen sterility. Other species showed normal tetraspore formation which resulted, however, in degrees of pollen sterility, with the American species, W. macrostachya and W. frutescens showing comparatively few cytoplasmic grains. Pollen sterility in this genus is explained as related to hybrid ancestry and is due to qualitative differences in the parental chromosomes.

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