The scientific classification of Oleander and Duckweed 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 Duckweed kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Oleander and Duckweed family is a major factor of Oleander and Duckweed 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 Duckweed belongs to the family Lemnaceae.
While comparing scientific classification, Oleander and Duckweed genus and other classification are also important. Also, when you compare Oleander and Duckweed, 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 Lemna. Oleander tribe is Wrightieae and Duckweed tribe is Lemneae. Oleander clade is Angiosperms, Asterids and Eudicots and order is Gentianales whereas Duckweed clade is Angiosperms and Monocots and order is Arales. Every plant have subfamilies. Oleander subfamilies are, Apocynoideae and Hippocastanoideae and Duckweed subfamilies are Lemnoideae. In this way you can compare scientific classification of Oleander and Duckweed and other products also.