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Somatic chromosome numbers of four species in the genus Crassocephalum were counted. Basic chromosome number of n=10 which was tentatively suggested for the genus by previous workers was confirmed. Three species, Crassocephalum rubens (Juss.ex.Jacq) S. Moore, C. biafrae (Oliv.& Hiern) S. Moore and C. togoense C.D. Adams had chromosome numbers of 2n=20 while 2n=40 was reported for the C. crepidioides (Benth.) S. Moore. The occurence of higher chromosome number in C. crepidioides suggests the species to be polyploid. Basic chromosome number of n=10 was confirmed for the genus.

Somatic Chromosome Counts In Some Species Of Crassocephalum (Moench.) S. Moore (Asteraceae) In Southwestern Nigeria.