作 者 ：YANG Qin-Er
期 刊 ：植物分类学报 1999年 1期
Keywords:Beesia calthifolia,
Abstract:
In this paper, the chromosomes of Beesia calthifolia were re-examined. In the 40
plant individuals of the population from Xinning County, Hunan Province, central China,
one was found to be tetraploid with the karyotype formula of 2n＝4x=32=16m+8sm＋4st
+ 4t, and the remaining were all found to be diploids with the karyotype formula of 2n＝2x
＝16=8m+4sm+2st+2t. All the 10 individuals of the population from Cangshan Moun-
tain, Dali City, Yunnan Province, southwestern China, were unexpectedly found to be te-
traploids with the karyotype formula of 2n＝4x＝32=16m+8sm+4st+4t. Tetraploid cy-
totype was reported in this species for the first time. Based on the results and those previous-
ly reported, it is considered that there may exist some errors in the results of the karyotype
analysis of this species previously reported by Shang(1985). He might have at least mistak-
enly recognized the centromere position of the fourth pair of chromosomes. This pair of chro-
mosomes should have subterminal rather than median centromeres. Furthermore, the kary-
otypic differences of B. calthifolia and B. deltophylla were analyzed and the systematic
position of the genus Beesia was discussed in detail.