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