The scientific classification of Celery 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. Celery and Echinopsis kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Celery and Echinopsis family is a major factor of Celery 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. Celery belongs to the family Apiaceae and Echinopsis belongs to the family Cactaceae.
While comparing scientific classification, Celery and Echinopsis genus and other classification are also important. Also, when you compare Celery and Echinopsis, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Apium and other plant's genus is Echinopsis. Celery tribe is Apieae and Echinopsis tribe is Trichocereeae. Celery clade is Angiosperms, Asterids and Eudicots and order is Apiales whereas Echinopsis clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales. Every plant have subfamilies. Celery subfamilies are, Apioideae and Echinopsis subfamilies are Cactoideae. In this way you can compare scientific classification of Celery and Echinopsis and other products also.