The scientific classification of Rhubarb and Blue Spruce 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 Blue Spruce kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Rhubarb and Blue Spruce family is a major factor of Rhubarb and Blue Spruce 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 Blue Spruce belongs to the family Pinaceae.
While comparing scientific classification, Rhubarb and Blue Spruce genus and other classification are also important. Also, when you compare Rhubarb and Blue Spruce, 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 Picea. Rhubarb tribe is Not Available and Blue Spruce tribe is Not Available. Rhubarb clade is Angiosperms, Core eudicots and Eudicots and order is Caryophyllales whereas Blue Spruce clade is Not Available and order is Pinales. Every plant have subfamilies. Rhubarb subfamilies are, Not Available and Blue Spruce subfamilies are Piceoideae. In this way you can compare scientific classification of Rhubarb and Blue Spruce and other products also.