The scientific classification of Citron and Echinopsis 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. Citron and Echinopsis kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Citron and Echinopsis family is a major factor of Citron and Echinopsis 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. Citron belongs to the family Rutaceae and Echinopsis belongs to the family Cactaceae.
While comparing scientific classification, Citron and Echinopsis genus and other classification are also important. Also, when you compare Citron and Echinopsis, 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 Echinopsis. Citron tribe is Citreae and Echinopsis tribe is Trichocereeae. Citron clade is Angiosperms, Eudicots and Rosids and order is Sapindales whereas Echinopsis clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales. Every plant have subfamilies. Citron subfamilies are, Aurantioideae and Echinopsis subfamilies are Cactoideae. In this way you can compare scientific classification of Citron and Echinopsis and other products also.