The scientific classification of Houseleek and Red Pitaya 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. Houseleek and Red Pitaya kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Houseleek and Red Pitaya family is a major factor of Houseleek and Red Pitaya 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. Houseleek belongs to the family Crassulaceae and Red Pitaya belongs to the family Cactaceae.
While comparing scientific classification, Houseleek and Red Pitaya genus and other classification are also important. Also, when you compare Houseleek and Red Pitaya, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Sempervivum and other plant's genus is Hylocereus. Houseleek tribe is Sedeae and Red Pitaya tribe is Cacteae. Houseleek clade is Angiosperms, Core eudicots and Eudicots and order is Rosales whereas Red Pitaya clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales. Every plant have subfamilies. Houseleek subfamilies are, Sedoideae and Red Pitaya subfamilies are Cactoideae. In this way you can compare scientific classification of Houseleek and Red Pitaya and other products also.