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The genus Impatiens L. has undergone an extensive cytoevolution, resulting in a series of chromosome numbers ranging from n=3 to n=33. Microsporogenesis was examined in 26 taxa; 17 exhibited abnormalities, which included precocious separation, lagging chromosomes, and bridges. Multiple microspores, containing 1-9 supernumerary cells, were common. In seven species, selected pollen characters were examined. Pollen stainability range was to vary from 14-91%. Micro- and subnormal-sized pollen grains were common. Colpi number varied within species. The role of aberrant gametogenesis in generating new chromosome numbers in Impatiens is discussed; and evidence for the hybrid origin of some of the taxa presented.

Aberrant microsporogenesis in Impatiens L. (Balsaminaceae) and its bearing on the taxonomy of the genus.