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