stomatal index

• 气孔指数

stomatal index的用法和样例：

例句

1. The stomatal density and stomatal index had little taxonomical significance among the six genera.However, the two characters might be useful for species identification.
   气孔密度和气孔指数在属间的分类意义不明显，但在属内种间的分类上具有一定价值。