The scientific classification of Sunflower and Red Pitaya 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. Sunflower and Red Pitaya kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Sunflower and Red Pitaya family is a major factor of Sunflower and Red Pitaya 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. Sunflower belongs to the family Asteraceae and Red Pitaya belongs to the family Cactaceae.
While comparing scientific classification, Sunflower and Red Pitaya genus and other classification are also important. Also, when you compare Sunflower and Red Pitaya, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Heilanthus and other plant's genus is Hylocereus. Sunflower tribe is Heliantheae and Red Pitaya tribe is Cacteae. Sunflower clade is Not Available and order is Asterales whereas Red Pitaya clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales. Every plant have subfamilies. Sunflower subfamilies are, Helianthodeae and Red Pitaya subfamilies are Cactoideae. In this way you can compare scientific classification of Sunflower and Red Pitaya and other products also.