作 者 ：JING Wang-Chun, XU Jie-Mei, YANG Lei
期 刊 ：植物分类学报 1999年 1期
Keywords:Allium,
Abstract:
Allium Sect. Anguinum G. Don (Liliaceae) includes five species and three vari-
eties. The results of investigation on 23 local populations, representing five species and one
variety of this section, are as follows: (1) In this section, the basic chromosome number is
x＝8, and the karyotypes of all the species belong to 2A type. All the populations have simi-
lar metaphase chromosomes. The similar karyotypical features support the viewpoint that
Sect. Anguinum is a natural taxon. (2) Despite the fact that the karyotypicat features appear
to be similar, karyotypical differences exist in some populations within the same species or
among the species. First, there are various levels of ploidy. Second, the occurrence, number
and shape of B chromosomes are variable among the populations. Third, as for the satellite
chromosomes, there is a polymorphism in occurrence of the tandem satellites. (3) Highly
sterile triploid of Allium ovalifolium has a kind of stolon and expands population by vegeta
tive propagation. (4) According to widely geographical distribution and relatively old geolog-
ical history of the geographical area, A. victorialis is considered as a primitive species in this
section. This species, by means of geographical (gradual) speciation, has evolved step by
step to the other species. (5) According to the geographical distribution and evolutionary
process of Sect. Anguinum, it is proposed that the region from the Hengduan Mountains to
the Qingling Range of China be the center of present distribution and differentiation of the
section.