Abstract
Chromosome numbers of 24 species (34 populations) of eight families under subclass Monochlamydeae of the dicots, collected from North India are presented. Seven new chromosome counts are recorded for six species: Aerva scandens (n=27), Croton bonplandianum (n=25), Euphorbia helioscopia (n=14), Euphorbia hirta (n=20), Boerhavia diffusa (n=26, 52) and Mirabilis jalapa (n=27). Indian populations of Polygonum multiflorum (n=11, 22) are counted for the first time. Number of total species and their chromosome numbers of presently investigated genera and their families have been reviewed to find out polyploidy percentage and probable base numbers in India.
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