Abstract
713 pollinations produced a total of 620 embryos, of which 34.4 % died on the culture medium. All the progenies attaining full growth proved to have resulted from self-pollination. Under greenhouse conditions only diploid red clover retained its strong self-incompatibility: pollinations made on it produced no progenies. Nonetheless, the pollinated inflorescences produced as many globular embryos as did those of alsike or of the tetraploid clovers. These globular embryos, which died on the culture medium, were probably hybrids whose development was arrested at the globular stage by strong post-fertilization crossing barriers between red and alsike clovers.
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