Abstract:There is a growing tendency among taxonomists to consider pollen grains of diagnostic value. The significance of the morphology of pollen grains in reference to hybridity and to polyploidy has also been emphasized by students of plants especially during the past ten or more years. As recorded by the senior author (1924) the nand zn. number of chromosomes for the ordinary bedding petunias is 7 and 14 and to this was added, in 1928, the statement that Petunia axillaris (Lam.) BSP. (P. nyctaginiflora juss.) is ch… Show more
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