The scientific classification of Brugmansia and Old Man Palm 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. Brugmansia and Old Man Palm kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Brugmansia and Old Man Palm family is a major factor of Brugmansia and Old Man Palm 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. Brugmansia belongs to the family Solanaceae and Old Man Palm belongs to the family Arecaceae.
While comparing scientific classification, Brugmansia and Old Man Palm genus and other classification are also important. Also, when you compare Brugmansia and Old Man Palm, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Brugmansia and other plant's genus is Coccothrinax. Brugmansia tribe is Datureae and Old Man Palm tribe is Cryosophileae. Brugmansia clade is Angiosperms, Asterids and Eudicots and order is Solanales whereas Old Man Palm clade is Angiosperms, Commelinids and Monocots and order is Arecales. Every plant have subfamilies. Brugmansia subfamilies are, Solanoideae and Old Man Palm subfamilies are Coryphoideae. In this way you can compare scientific classification of Brugmansia and Old Man Palm and other products also.