The scientific classification of Bush Penstemon and White Onion 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 White Onion kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Bush Penstemon and White Onion family is a major factor of Bush Penstemon and White Onion 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 White Onion belongs to the family Liliaceae.
While comparing scientific classification, Bush Penstemon and White Onion genus and other classification are also important. Also, when you compare Bush Penstemon and White Onion, 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 Allium. Bush Penstemon tribe is Not Available and White Onion tribe is Allieae. Bush Penstemon clade is Angiosperms, Asterids and Eudicots and order is Scrophulariales whereas White Onion clade is Angiosperms and Monocots and order is Asparagales. Every plant have subfamilies. Bush Penstemon subfamilies are, Not Available and White Onion subfamilies are Allioideae. In this way you can compare scientific classification of Bush Penstemon and White Onion and other products also.