The scientific classification of Oatgrass and Cocklebur 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. Oatgrass and Cocklebur kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Oatgrass and Cocklebur family is a major factor of Oatgrass and Cocklebur 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. Oatgrass belongs to the family Poaceae and Cocklebur belongs to the family Asclepiadaceae.
While comparing scientific classification, Oatgrass and Cocklebur genus and other classification are also important. Also, when you compare Oatgrass and Cocklebur, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Danthonia and other plant's genus is Xanthium. Oatgrass tribe is Aveneae and Cocklebur tribe is Heliantheae. Oatgrass clade is Angiosperms, Commelinids and Monocots and order is Poales whereas Cocklebur clade is Angiosperms, Asterids and Eudicots and order is Asterales. Every plant have subfamilies. Oatgrass subfamilies are, Danthonioideae and Cocklebur subfamilies are Asteroideae. In this way you can compare scientific classification of Oatgrass and Cocklebur and other products also.