Abstract
The present paper deals with the meiotic study of 15 species belonging to 7 genera of 3 families of order Malvales i.e. Malvaceae, Sterculiaceae and Tiliaceae from different geographical areas of Rajasthan. Out of 15 species, intraspecific cytotypes at tetraploid and diploid level of Triumfetta rhomboidea has been reported for the first time. The chromosome numbers of 6 species i.e. Abutilon pannosum, Sida ovata, Sida rhombifolia, T. rhomboidea are reported for the first time from India. Whereas, chromosome studies on Melhania magnifolia have been worked out for the first time, also the occurrence of new cytotypes of Abutilon ramosum (2n = 42) are the first record in global context. Meiotic course is found to be abnormal in case of T. rhomboidea, A. pannosum and A. ramosum with the presence of laggards, chromatin bridges, unoriented bivalents and cytomixis, leading to the reduced pollen fertility and heterogenous sized pollen grains.
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