特殊用法canoe birch1.纸皮桦common birch1.欧洲桦drooping birch1.欧洲白桦dwarf birch1.矮桦European birch1.欧洲桦Japanese birch1.白桦mahogany birch1.山桦paper birch1.纸皮桦red birch1.红桦silver birch1.疣皮桦yellow birch1.加拿大桦; 黄桦