The chromosome number and karyotype of seven species of Indigofera
L.were studied by applying the root tip squash technique.Results show that six species were diploid(2n= 2x=16),while Indigofera zollingeriana Miq.was tetraploid(2n= 2x= 32).The karyotypes of I.zollingeriana
Pamp.belonged to 2A,while the others were 1A.The karyological difference between species was small.Most chromosomes in the tested seven species were metacentric.The karyomorphology of I.delavayi
Craib and I.zollingeriana
Miq.are reported here for the first time.