The scientific classification of Pecan 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. Pecan and Duckweed kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Pecan and Duckweed family is a major factor of Pecan 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. Pecan belongs to the family Juglandaceae and Duckweed belongs to the family Lemnaceae.
While comparing scientific classification, Pecan and Duckweed genus and other classification are also important. Also, when you compare Pecan and Duckweed, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Carya Nutt. and other plant's genus is Lemna. Pecan tribe is Juglandeae and Duckweed tribe is Lemneae. Pecan clade is Angiosperms, Eudicots and Rosids and order is Juglandales whereas Duckweed clade is Angiosperms and Monocots and order is Arales. Every plant have subfamilies. Pecan subfamilies are, Juglandoideae and Duckweed subfamilies are Lemnoideae. In this way you can compare scientific classification of Pecan and Duckweed and other products also.