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Studies in Ranunculus. 1. Preliminary account of petal colour and sex in Ranunculus acris and R. bulbosus



Studies in Ranunculus. 1. Preliminary account of petal colour and sex in Ranunculus acris and R. bulbosus



Jour Genetics cambridge 21(2): 169-181



A short historical account is given dealing with the occurrence of color and sex variations in nature. The variations worked with are defined. Though the definitions were drawn up before cytological investigations had been made, they agree with the cytological findings. The plants used in the experiments are described, the most remarkable being a plant of R. acris referred to in the paper as "male," which was collected in the wild, and which is believed to be the only such plant in existence. An account is given of the controlled breeding work and of experiments indicating the probability of apomixis; the species also shows a high degree of self sterility. The paper is published at a preliminary stage to indicate the work in progress in the genus Ranunculus, to correlate the genetical and descriptive aspects of the research with the cytological, and to enable the publication of the "time-factor" theory of sex expression by publishing the descriptions of stock plants and a preliminary account of the breeding work in which they have been used. At present it is not possible to give satisfactory genetical explanations of the empirical ratios obtained either for sex or for color.

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