The scientific classification of Rhubarb and Heart of Flame 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. Rhubarb and Heart of Flame kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Rhubarb and Heart of Flame family is a major factor of Rhubarb and Heart of Flame 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. Rhubarb belongs to the family Polygonaceae and Heart of Flame belongs to the family Bromeliaceae.
While comparing scientific classification, Rhubarb and Heart of Flame genus and other classification are also important. Also, when you compare Rhubarb and Heart of Flame, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Rheum and other plant's genus is Bromelia. Rhubarb tribe is Not Available and Heart of Flame tribe is Not Available. Rhubarb clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales whereas Heart of Flame clade is Angiosperms, Commelinids and Monocots and order is Poales. Every plant have subfamilies. Rhubarb subfamilies are, Not Available and Heart of Flame subfamilies are Bromelioideae. In this way you can compare scientific classification of Rhubarb and Heart of Flame and other products also.