Abstract
In Cucurbita maxima Duch., C. moschata Duch. and C. pepo L., the number of chromosomes was determined to be n=20 and 2n=40, no varietal differences being able to observed so far as the writer's investigations go (Cf. Table 2). In the somatic cells there were observed one pair or possibly two pairs of long chromosomes which have median constriction. The persistent nucleoli, that were multifarious in size and number, were frequently observed. In the pollen mother cells there was one large bivalent of median constriction.
The sizes were measured in the first metaphasic cells and nuclei, showing that in all cases the diameter of cell was 6, 5 to 8, 0 times as large as that of nucleus (Cf. Table 3).
Polysomatic cells were observed in all the three Cucurbita species. De Litardiére's view was supported from the observed data that there are often found the typical pairings of chromosomes among the metaphases of polysomatic cells and that the somatic diakinesis-like arrangement of chromosomes may be met with.
