摘要
描述了２２个毛白杨无性系的花器变异。根据花的苞片形态，将这些无性系分为３大类群，即银白杨类、中国山杨类和毛白杨类。这说明毛白杨是银白杨和中国山杨的天然杂种。此外，亲本类无性系少，毛白杨类无系多，而且在毛白杨类中还有一定变异。
The floral characteristics of twenty-two P.tomentosa clones were described in detail.Based on some characteristics,particularlly bracts,the clones were divided into three populations,i.e.,P.davidiona-like,P.alba-like and P.tomentosa-like.It was suggested that P.tomentosa was a natural hybrid of P.alba and P.davidiana.In addition,parent-like clones were rare,while P.tomentosa-like clones were abundent.Within the P.tomentosa-like group,there was considerable variation.
出处
《西北林学院学报》
CSCD
1995年第1期43-47,共5页
Journal of Northwest Forestry University
关键词
毛白杨
无性系
变异
花器
类群
P.tomentosa
clone
variation
floral organ
population
variation causes
