Abstract
Results of cytological studies on 48 species representing 30 genera belonging to the tribes Andropogoneae and Maydeae are presented in this paper. The basic chromosome numbers recorded are 5 (or 10) in 37 species, 7 in one species, 8 in 5 species and 9 in 5 species. It has been suggested that 5 may be regarded as the primary basic number of these two tribes. The basic number 10 was derived from 5 primarily through allopolyploidy and the other basic numbers were of secondary origin from 10. The highly specialised tribe Maydeae are a natural extension of the tribe Andropogoneae. The three tribes Paniceae, Andropogoneae and Maydeae belonging to the subfamily Panicoideae resemble each other in many respects and it is probable they originated from the same ancestral stock with the primary basic number 5.
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