The scientific classification of Aster and Astilbe 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. Aster and Astilbe kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Aster and Astilbe family is a major factor of Aster and Astilbe 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. Aster belongs to the family Asteraceae and Astilbe belongs to the family Saxifragaceae.
While comparing scientific classification, Aster and Astilbe genus and other classification are also important. Also, when you compare Aster and Astilbe, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Aster and other plant's genus is Astilbe. Aster tribe is Astereae and Astilbe tribe is Not Available. Aster clade is Angiosperms, Asterids and Eudicots and order is Asterales whereas Astilbe clade is Angiosperms, Core eudicots and Eudicots and order is Rosales. Every plant have subfamilies. Aster subfamilies are, Asteroideae and Astilbe subfamilies are Not Available. In this way you can compare scientific classification of Aster and Astilbe and other products also.