The scientific classification of Tree-of-Heaven and Flowering Quince 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 Flowering Quince kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Tree-of-Heaven and Flowering Quince family is a major factor of Tree-of-Heaven and Flowering Quince 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 Flowering Quince belongs to the family Rosaceae.
While comparing scientific classification, Tree-of-Heaven and Flowering Quince genus and other classification are also important. Also, when you compare Tree-of-Heaven and Flowering Quince, 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 Chaenomeles. Tree-of-Heaven tribe is and Flowering Quince tribe is Maleae. Tree-of-Heaven clade is Angiosperms, Eudicots and Rosids and order is Sapindales whereas Flowering Quince clade is Angiosperms, Eudicots and Rosids and order is Rosales. Every plant have subfamilies. Tree-of-Heaven subfamilies are, and Flowering Quince subfamilies are Amygdaloideae. In this way you can compare scientific classification of Tree-of-Heaven and Flowering Quince and other products also.