The scientific classification of American Arborvitae and Oatgrass includes the entire classification chart that includes kingdom, family, clade, tribe etc. A kingdom is the second highest taxonomic rank. A taxonomic rank is the level that a living organisms are placed in hierarchical level of arrangement of life forms. All the living organisms are divided into kingdoms. Plant kingdom is a main classification of living organisms that include all plants. There are six kingdoms which are: Plantae, Animalia, Fungi, Protista, Aschaea/Archaeabacteria and Bacteria Eubacteria. American Arborvitae and Oatgrass kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. American Arborvitae and Oatgrass family is a major factor of American Arborvitae and Oatgrass Scientific Classification. Plant family helps you narrow the search of your plants. It also gives you idea about, how the plant looks, how the seed will be like etc. These two plant families can be different or same. American Arborvitae belongs to the family Cupressaceae and Oatgrass belongs to the family Poaceae.
While comparing scientific classification, American Arborvitae and Oatgrass genus and other classification are also important. Also, when you compare American Arborvitae and Oatgrass, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Arborvitae and other plant's genus is Danthonia. American Arborvitae tribe is Not Available and Oatgrass tribe is Aveneae. American Arborvitae clade is Not Available and order is Pinales whereas Oatgrass clade is Angiosperms, Commelinids and Monocots and order is Poales. Every plant have subfamilies. American Arborvitae subfamilies are, Cupressoideae and Oatgrass subfamilies are Danthonioideae. In this way you can compare scientific classification of American Arborvitae and Oatgrass and other products also.