The scientific classification of Grapefruit and Kou 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. Grapefruit and Kou kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Grapefruit and Kou family is a major factor of Grapefruit and Kou 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. Grapefruit belongs to the family Rutaceae and Kou belongs to the family Boraginaceae.
While comparing scientific classification, Grapefruit and Kou genus and other classification are also important. Also, when you compare Grapefruit and Kou, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Citrus and other plant's genus is Cordia. Grapefruit tribe is Not Available and Kou tribe is Not Available. Grapefruit clade is Dicotyledonous and order is Sapindales whereas Kou clade is Angiosperms, Asterids and Eudicots and order is Lamiales. Every plant have subfamilies. Grapefruit subfamilies are, Rosoideae and Kou subfamilies are Not Available. In this way you can compare scientific classification of Grapefruit and Kou and other products also.