据营养器官的形态结构判断，在海金沙胚胎发育中最早出现的营养器官是叶和根。
On the basis of the structure of vegetable organs, the first leaf and root are the earliest organs in the development of embryo.
主成分分析结果表明，营养器官是狗牙根形态分类的重要指标。
The result fo Principal Component Analysis (PCA) shows that the vegetative characters are the major characters in morphological classification of C.
主成分分析结果表明，营养器官是狗牙根形态分类的重要指标。
The result fo Principal Component Analysis (PCA) shows that the vegetative characters are the major characters in morphological classification of C.
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