Annals of Botany 22: 55-72, 1958
© 1958 Annals of Botany Company
RESEARCH-ARTICLE |
Sexuality in Diploid and Hexaploid Races of Mercurialis annua L
Botany Department, University College London
The variation in sex expression found between individuals of Mercurialis annua agg. is described, distinction being made between regular and irregular monoecism. There is shown to be a relationship between sexuality, morphology, and chromosome number.
M. annua sensu stricta and M. annua var. ambigua are shown to be cytologically distinct, the former being diploid, the latter hexaploid. It is recommended that M. annua var. ambigua be regarded as a speciesM. ambiguaas originally proposed by Linnaeus fils.
Past investigations into the inheritance of sex are reviewed and results of further investigations into the inheritance of monoecism in M. annua var. ambigua are presented. Evidence obtained supports the hypothesis that the allosome constitution of male plants is XXXXXY and that of monoecious plants is XXXXXX.