Cytopalynological studies have been carried out inCelosia(Amaranthaceae) #x2014; a polyploid species complex having both wild and cultivated species. The studies includeC. trigyna2#xD7; (wild),C. argentea4#xD7; and 8#xD7; (wild), 8#xD7; colchiploid, 12#xD7; (synthetic),C. cristata4#xD7; (cultivated: varieties and cultivars),C. whiteii12#xD7; (wild), and F1 hybrids (i)C. argentea4#xD7; (wild) #xD7;C. argentea8#xD7; (wild)-6#xD7;, (ii)C. argentea12#xD7; (synthetic) #xD7;C. whiteii12#xD7; (wild)-12#xD7;, (iii)C. whiteii12#xD7; (wild) #xD7;C. argentea12#xD7; (synthetic)-12#xD7;. Though the genus is stenopalynous with pantoporate pollen grains, cytotypic differences have been observed in pollen size, exine ornamentation and exine thickness even at varietal and cultivar levels.C. trigyna, the diploid wild species is clearly separated by pollen size and exine ornamentation from 4#xD7;, 8#xD7; and 12#xD7; species. In the F1 hybrids, the exine characters are intermediate between the parents. In reciprocal 12#xD7; F1 hybrids, the pollen size is variable and resembles that of the male parent in each case, though other exine features are similar in both.
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