The scientific classification of Oatgrass and Goiabeira 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 Goiabeira kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Oatgrass and Goiabeira family is a major factor of Oatgrass and Goiabeira 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 Goiabeira belongs to the family Myrtaceae.
While comparing scientific classification, Oatgrass and Goiabeira genus and other classification are also important. Also, when you compare Oatgrass and Goiabeira, 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 Psidium guajava. Oatgrass tribe is Aveneae and Goiabeira tribe is Myrteae. Oatgrass clade is Angiosperms, Commelinids and Monocots and order is Poales whereas Goiabeira clade is Angiosperms, Eudicots and Rosids and order is Myrtales. Every plant have subfamilies. Oatgrass subfamilies are, Danthonioideae and Goiabeira subfamilies are Myrtoideae. In this way you can compare scientific classification of Oatgrass and Goiabeira and other products also.