Analysis of the Anatomical Differences of Stems and Leaves between Female and Male Plants of Populus yunnanensis Dode

• Zhanghong DONG, 
• Yamei YIN, 
• Jian XU, 
• Xianhuang LI, 
• Shaohong QU, 
• Jing XIN, 
• Xiaoyong CHANG, 
• Peiyao XIN