The scientific classification of Barley and Eastern Cottonwood 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. Barley and Eastern Cottonwood kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Barley and Eastern Cottonwood family is a major factor of Barley and Eastern Cottonwood 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. Barley belongs to the family Poaceae and Eastern Cottonwood belongs to the family Salicaceae.
While comparing scientific classification, Barley and Eastern Cottonwood genus and other classification are also important. Also, when you compare Barley and Eastern Cottonwood, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Hordeum and other plant's genus is Populus. Barley tribe is Triticeae and Eastern Cottonwood tribe is Not Available. Barley clade is Angiosperms, Commelinids and Monocots and order is Cyperales whereas Eastern Cottonwood clade is Angiosperms, Eudicots and Rosids and order is Salicales. Every plant have subfamilies. Barley subfamilies are, Pooideae and Eastern Cottonwood subfamilies are Salicoideae. In this way you can compare scientific classification of Barley and Eastern Cottonwood and other products also.