作 者 ：Kurban·Nizamidin
期 刊 ：植物分类学报 1984年 6期
Keywords:Ceratoides,
Abstract:
The karyotypes of 3 species of Ceratoides (C. arborescens, C. ewersman-
niana and C. latens) were studied. The results show that C. arborescens is a diploid,
with karyotype formula 2n=2x=18=16m+2sm, C. ewersmanniana is also a diploid, with
2n=2x=18=14m+4sm, while C. latens is a tetraploid, with 2n=4x=36=24m+12sm. Ac-
cording to the karyotypes, the morphological features and geographical distribution, C.
arborescens seems to be a primitive species and it might have originated in northern
China. C. arborescens and C. ewersmanniana are similar to each other, not only in mor-
phology but also in karyotype, which shows that they are closely related and that C. ar-
borescens might be the progenitor of C. ewersmanniana. The karyotypes of the 3 species
of Ceratoides are basically identical, with only minor differences.