The scientific classification of Houseleek and Gardenia 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 Gardenia kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Houseleek and Gardenia family is a major factor of Houseleek and Gardenia 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 Gardenia belongs to the family Rubiaceae.
While comparing scientific classification, Houseleek and Gardenia genus and other classification are also important. Also, when you compare Houseleek and Gardenia, 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 Gardenia. Houseleek tribe is Sedeae and Gardenia tribe is Gardenieae. Houseleek clade is Angiosperms, Core eudicots and Eudicots and order is Rosales whereas Gardenia clade is Angiosperms, Asterids and Eudicots and order is Gentianales. Every plant have subfamilies. Houseleek subfamilies are, Sedoideae and Gardenia subfamilies are Ixoroideae. In this way you can compare scientific classification of Houseleek and Gardenia and other products also.