Abstract
Hymenocallis littoralis (2n=46) and H. tenuiflora (2n=66) were studied cytologically and the present report of 2n=66, is new for the latter species. Both are atelocentric species. Karyotype and meiotic studies reveal the basic number as 11 for both the species and they are secondarily balanced segmental allopolyploids. Speciation is rather rapid and the major processes for evolution seem to include structural alternations like inversions and translocations; further polyploidy coupled with hybridization also might have played an important role in evolution.
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