榆树任一种榆属的落叶树木，有拱形或曲线形树枝和锯齿形不对称的树叶。
Any of various deciduous trees of the genus Ulmus, characteristically having arching or curving branches and serrate leaves with asymmetrical bases. Elms are widely planted as shade trees.
利用叶表皮离析法观察了榆科6属9种植物叶片的表皮结构。
Epidermal characters of mature leaves in 9 species belonging to 6 genera of Ulmaecae were investigated with the help of epidermal maceration and light microscope.
利用叶表皮离析法观察了榆科6属9种植物叶片的表皮结构。
Epidermal characters of mature leaves in 9 species belonging to 6 genera of Ulmaecae were investigated with the help of epidermal maceration and light microscope.
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