The scientific classification of Petunia and Musk Thistle 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. Petunia and Musk Thistle kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Petunia and Musk Thistle family is a major factor of Petunia and Musk Thistle 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. Petunia belongs to the family Solanaceae and Musk Thistle belongs to the family Asteraceae.
While comparing scientific classification, Petunia and Musk Thistle genus and other classification are also important. Also, when you compare Petunia and Musk Thistle, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Petunia and other plant's genus is Carduus. Petunia tribe is Not Available and Musk Thistle tribe is Cynareae. Petunia clade is Angiosperms, Asterids and Eudicots and order is Solanales whereas Musk Thistle clade is Angiosperms, Asterids and Eudicots and order is Asterales. Every plant have subfamilies. Petunia subfamilies are, Petunioideae and Musk Thistle subfamilies are Carduoideae. In this way you can compare scientific classification of Petunia and Musk Thistle and other products also.