The scientific classification of Guava and Japanese Pieris 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. Guava and Japanese Pieris kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Guava and Japanese Pieris family is a major factor of Guava and Japanese Pieris 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. Guava belongs to the family Myrtaceae and Japanese Pieris belongs to the family Ericaceae.
While comparing scientific classification, Guava and Japanese Pieris genus and other classification are also important. Also, when you compare Guava and Japanese Pieris, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Psidium guajava and other plant's genus is Pieris. Guava tribe is Not Available and Japanese Pieris tribe is Lyonieae. Guava clade is Dicotyledonous and order is Myrtales whereas Japanese Pieris clade is Angiosperms, Asterids and Eudicots and order is Ericales. Every plant have subfamilies. Guava subfamilies are, Rosoideae and Japanese Pieris subfamilies are Vaccinioideae. In this way you can compare scientific classification of Guava and Japanese Pieris and other products also.