Abstract
This paper deals with cytomorphological studies in Urginea indica Kunth. (2n=20) and U. coromandeliana (Roxb.) Hook. f. (2n=40). It has been revealed from the present investigation that U. coromandeliana is not an exact multiplication of chromosomes of U. indica, but segmental polyploid of hybrid origin. The geographical isolation, ecological factors, chromosomal repattering, hybridization and ploidy level seem to be responsible for morphological diversity in U. coromandeliana and support Hooker's (1892) recognition as a separate species. Experimental interspecific hybridization in Urginea species indicated the close interrelationship between U. indica, U. polyantha, U. govindappae and U. coromandeliana, and ‘Weak’ incompatibility reaction between U. indica and U. razii, U. coromandeliana and U. razii and distant relationship of U. congesta with other species of Urginea under investigation.
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