Cytological Investigations on the Indian Compositae. II. Astereae, Heliantheae, Helenieae and Anthemideae

Abstract

SUMMARYCytotaxonomic observations have been made on 71 Indian taxa of the tribes Astereae, Anthemideae, Heliantheae and Helenieae (family Compositae). Cytological races have been reported in 5 species. It is concluded that the basic number x = 9 which is so common in Astereae and Anthemideae is perhaps of ancient polyploid origin and may have been derived ultimately from x = 5 of the ancestral stock through polyploidy and aneuploidal reduction. In Heliantheae no definite base number is observable.