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