The scientific classification of Oatgrass and Breath-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. Oatgrass and Breath-of-Heaven kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Oatgrass and Breath-of-Heaven family is a major factor of Oatgrass and Breath-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. Oatgrass belongs to the family Poaceae and Breath-of-Heaven belongs to the family Rutaceae.
While comparing scientific classification, Oatgrass and Breath-of-Heaven genus and other classification are also important. Also, when you compare Oatgrass and Breath-of-Heaven, 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 Coleonema. Oatgrass tribe is Aveneae and Breath-of-Heaven tribe is Not Available. Oatgrass clade is Angiosperms, Commelinids and Monocots and order is Poales whereas Breath-of-Heaven clade is Not Available and order is Sapindales. Every plant have subfamilies. Oatgrass subfamilies are, Danthonioideae and Breath-of-Heaven subfamilies are Magnolioideae. In this way you can compare scientific classification of Oatgrass and Breath-of-Heaven and other products also.