Triploid and tetraploid intersex of Rumex Acetosa, L

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Abstract
As is already known (KIHARA and ONO, 1923, 1925), the diploid number of chromosomes of Rumex Acetosa, L. is 15 (=12a+X+2Y) in the male and 14 (=12a+2X) in the female. The present authors have investigated the diploid numbers of chromosomes of a number of intersexual plants, which are found sometimes growing wild. Mostly they are 22 (triploid) and in one case 29 (tetraploid). The formulae of these chromosomes should be perhaps, as follows: 22=18a+2X+2Y 29=24a+3X+2Y Large, equal-armed, V-shaped X-chromosomes can be identified usually with no difficulty. The intersexual plants should have arisen therefore from the union of the diploid and haploid or both diploid gametes, the intersex being caused by the broken balance between the autosomes and sex-chromosomes.

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