A Karyological Study of Six Species of Cleisostoma from Hainan

The chromosome number and karyotype of six species in Cleisostoma from Hainan were studied by applying root tip squash method.The results showed that the Cleisostoma paniculatum(ker-Gawl.) Garay 2n=2x=38=36m+2sm,C.striatum(Rchb.f.) Garay 2n=2x=38=2M+36m,C.parishii(Hook.f.) Garay 2n=2x=38=2M+34m+2sm,C.filiforme(Lindl.) Garay 2n=2x=38=38m,C.rostratum(Lodd.) Seidenf 2n=2x=38=36m+2sm and C.williamsonii(Rchb.f.) Garay 2n=2x=38=34m+4sm(2SAT).Its karyotype mainly consists of metacentric chromosomes.All of the karyotypes belong to 1B type except the C.rostratum(Lodd.) Seidenf is 1A.