The scientific classification of Tree-of-Heaven and Sitka Spruce 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 Sitka Spruce kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Tree-of-Heaven and Sitka Spruce family is a major factor of Tree-of-Heaven and Sitka Spruce 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 Sitka Spruce belongs to the family Aceraceae.
While comparing scientific classification, Tree-of-Heaven and Sitka Spruce genus and other classification are also important. Also, when you compare Tree-of-Heaven and Sitka Spruce, 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 Picea. Tree-of-Heaven tribe is Not Available and Sitka Spruce tribe is Not Available. Tree-of-Heaven clade is Angiosperms, Eudicots and Rosids and order is Sapindales whereas Sitka Spruce clade is Not Available and order is Pinales. Every plant have subfamilies. Tree-of-Heaven subfamilies are, Not Available and Sitka Spruce subfamilies are Piceoideae. In this way you can compare scientific classification of Tree-of-Heaven and Sitka Spruce and other products also.