The scientific classification of Bush Penstemon and Adam's Needle 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 Adam's Needle kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Bush Penstemon and Adam's Needle family is a major factor of Bush Penstemon and Adam's Needle 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 Adam's Needle belongs to the family Agavaceae.
While comparing scientific classification, Bush Penstemon and Adam's Needle genus and other classification are also important. Also, when you compare Bush Penstemon and Adam's Needle, 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 Yucca. Bush Penstemon tribe is Not Available and Adam's Needle tribe is Not Available. Bush Penstemon clade is Angiosperms, Asterids and Eudicots and order is Scrophulariales whereas Adam's Needle clade is Angiosperms and Monocots and order is Liliales. Every plant have subfamilies. Bush Penstemon subfamilies are, Not Available and Adam's Needle subfamilies are Agavoideae. In this way you can compare scientific classification of Bush Penstemon and Adam's Needle and other products also.