It falls outside the scope of the formal taxonomic categories. 它不包括正規靠譜的植被歸類學的歸類階元的本質屬性。
For instance, all birds and reptiles are believed to have descended from a single common ancestor, so this taxonomic grouping is called monophyletic. 舉個例子，所有的鳥類和爬行運動節肢動物被因為辦法是一個一種的相互先祖傳下的，從而該劃分學的分成小組被統稱單系例群。
美
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