在叶鞘裹住的幼叶下部呈现螺旋状。
A spiral deformation occured in the lower part of the young leaf enclosed in the sheath.
发现叶下部茸毛的类型和颜色可作为较明显的鉴别特征。
Obvious distinctive features of color and types of villi on the back of the leaf were found.
例如，一些卷烟制造商可能喜欢在卷烟中用较多的顶叶等级烟叶，而另一些则可能喜欢买少量的下部叶。
For example, some cigarette manufacturers would like to see greater production of tip grades for use in blending while others would like to buy less lower-stalk tobacco.
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