The scientific classification of Petunia and Douglas Fir 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 Douglas Fir kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Petunia and Douglas Fir family is a major factor of Petunia and Douglas Fir 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 Douglas Fir belongs to the family Pinaceae.
While comparing scientific classification, Petunia and Douglas Fir genus and other classification are also important. Also, when you compare Petunia and Douglas Fir, 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 Pseudotsuga. Petunia tribe is Not Available and Douglas Fir tribe is Not Available. Petunia clade is Angiosperms, Asterids and Eudicots and order is Solanales whereas Douglas Fir clade is Not Available and order is Pinales. Every plant have subfamilies. Petunia subfamilies are, Petunioideae and Douglas Fir subfamilies are Not Available. In this way you can compare scientific classification of Petunia and Douglas Fir and other products also.