The scientific classification of Big Bluestem 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. Big Bluestem and Adam's Needle kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Big Bluestem and Adam's Needle family is a major factor of Big Bluestem 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. Big Bluestem belongs to the family Poaceae and Adam's Needle belongs to the family Agavaceae.
While comparing scientific classification, Big Bluestem and Adam's Needle genus and other classification are also important. Also, when you compare Big Bluestem and Adam's Needle, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Andropogon and other plant's genus is Yucca. Big Bluestem tribe is Not Available and Adam's Needle tribe is Not Available. Big Bluestem clade is Angiosperms, Commelinids and Monocots and order is Poaceae whereas Adam's Needle clade is Angiosperms and Monocots and order is Liliales. Every plant have subfamilies. Big Bluestem subfamilies are, Not Available and Adam's Needle subfamilies are Agavoideae. In this way you can compare scientific classification of Big Bluestem and Adam's Needle and other products also.