The scientific classification of Bush Penstemon and Citron 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. Bush Penstemon and Citron kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Bush Penstemon and Citron family is a major factor of Bush Penstemon and Citron 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. Bush Penstemon belongs to the family Scrophulariaceae and Citron belongs to the family Rutaceae.
While comparing scientific classification, Bush Penstemon and Citron genus and other classification are also important. Also, when you compare Bush Penstemon and Citron, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Penstemon and other plant's genus is Citrus. Bush Penstemon tribe is Not Available and Citron tribe is Citreae. Bush Penstemon clade is Angiosperms, Asterids and Eudicots and order is Scrophulariales whereas Citron clade is Angiosperms, Eudicots and Rosids and order is Sapindales. Every plant have subfamilies. Bush Penstemon subfamilies are, Not Available and Citron subfamilies are Aurantioideae. In this way you can compare scientific classification of Bush Penstemon and Citron and other products also.