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