The scientific classification of Tree-of-Heaven and Russian Olive 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. Tree-of-Heaven and Russian Olive kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Tree-of-Heaven and Russian Olive family is a major factor of Tree-of-Heaven and Russian Olive 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. Tree-of-Heaven belongs to the family Simaroubaceae and Russian Olive belongs to the family Elaeagnaceae.
While comparing scientific classification, Tree-of-Heaven and Russian Olive genus and other classification are also important. Also, when you compare Tree-of-Heaven and Russian Olive, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Ailanthus and other plant's genus is Elaeagnus. Tree-of-Heaven tribe is Not Available and Russian Olive tribe is Not Available. Tree-of-Heaven clade is Angiosperms, Eudicots and Rosids and order is Sapindales whereas Russian Olive clade is Angiosperms, Eudicots and Rosids and order is Rhamnales. Every plant have subfamilies. Tree-of-Heaven subfamilies are, Not Available and Russian Olive subfamilies are Not Available. In this way you can compare scientific classification of Tree-of-Heaven and Russian Olive and other products also.