The scientific classification of Oatgrass and Blue Barrel 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. Oatgrass and Blue Barrel kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Oatgrass and Blue Barrel family is a major factor of Oatgrass and Blue Barrel 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. Oatgrass belongs to the family Poaceae and Blue Barrel belongs to the family Cactaceae.
While comparing scientific classification, Oatgrass and Blue Barrel genus and other classification are also important. Also, when you compare Oatgrass and Blue Barrel, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Danthonia and other plant's genus is Echinocactus. Oatgrass tribe is Aveneae and Blue Barrel tribe is Cacteae. Oatgrass clade is Angiosperms, Commelinids and Monocots and order is Poales whereas Blue Barrel clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales. Every plant have subfamilies. Oatgrass subfamilies are, Danthonioideae and Blue Barrel subfamilies are Cactaceae. In this way you can compare scientific classification of Oatgrass and Blue Barrel and other products also.