The scientific classification of Oleander and Hydrangea 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. Oleander and Hydrangea kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Oleander and Hydrangea family is a major factor of Oleander and Hydrangea 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. Oleander belongs to the family Apocynaceae and Hydrangea belongs to the family Hydrangeaceae.
While comparing scientific classification, Oleander and Hydrangea genus and other classification are also important. Also, when you compare Oleander and Hydrangea, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Nerium and other plant's genus is Hydrangea. Oleander tribe is Wrightieae and Hydrangea tribe is Not Available. Oleander clade is Angiosperms, Asterids and Eudicots and order is Gentianales whereas Hydrangea clade is Not Available and order is Cornales. Every plant have subfamilies. Oleander subfamilies are, Apocynoideae and Hippocastanoideae and Hydrangea subfamilies are Not Available. In this way you can compare scientific classification of Oleander and Hydrangea and other products also.