The scientific classification of Pennywort and Watermilfoil 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. Pennywort and Watermilfoil kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Pennywort and Watermilfoil family is a major factor of Pennywort and Watermilfoil 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. Pennywort belongs to the family Apiaceae and Watermilfoil belongs to the family Haloragaceae.
While comparing scientific classification, Pennywort and Watermilfoil genus and other classification are also important. Also, when you compare Pennywort and Watermilfoil, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Hydrocotyle and other plant's genus is Myriophyllum. Pennywort tribe is Not Available and Watermilfoil tribe is Not Available. Pennywort clade is Angiosperms, Asterids and Eudicots and order is Apiales whereas Watermilfoil clade is Angiosperms, Core eudicots and Eudicots and order is Saxifragales. Every plant have subfamilies. Pennywort subfamilies are, Not Available and Watermilfoil subfamilies are Not Available. In this way you can compare scientific classification of Pennywort and Watermilfoil and other products also.