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