Somatic chromosome counts are reported on 23 species of Ipomoea L, found in Australia. The majority are diploids of the basic number x = 15 (2n = 30), but three exhibit tetraploidy (2n = 60), namely J. plebeia R. Br., I. lonchophylla J. Black and I, racemigera F. Muell. These results are discussed in comparison with the cytology of other Iparnoea species in the world, endemism of Australian species and the possibility of parallel but limited polyploidy as one product of geographically separate evolution in the genus.
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