The scientific classification of Houseleek and Joshua Tree 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 Joshua Tree kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Houseleek and Joshua Tree family is a major factor of Houseleek and Joshua Tree 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 Joshua Tree belongs to the family Agavaceae.
While comparing scientific classification, Houseleek and Joshua Tree genus and other classification are also important. Also, when you compare Houseleek and Joshua Tree, 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 Yucca. Houseleek tribe is Sedeae and Joshua Tree tribe is Not Available. Houseleek clade is Angiosperms, Core eudicots and Eudicots and order is Rosales whereas Joshua Tree clade is Angiosperms and Monocots and order is Asparagales. Every plant have subfamilies. Houseleek subfamilies are, Sedoideae and Joshua Tree subfamilies are Not Available. In this way you can compare scientific classification of Houseleek and Joshua Tree and other products also.