Plants are classified hierarchically by their division, class, subclass, order, family, genus, and species. They are also classified by variety and cultivar when necessary. Here’s how the tea plant shakes out:
Division -> Magnoliophyta
Class -> Magnoliopsida
Subclass -> Dilleniidae
Order -> Theales
Family -> Theaceae
Genus -> Camellia
Species -> Sinensis
Since we’ll only be dealing with the varieties and cultivars of the genus Camellia and the species sinensis we’ll leave out the higher level classifications and just start with Camellia sinensis for the sake of simplicity throughout the rest of this post. When notating plant names, there is a standard nomenclature we’ll use defined as follows:
Genus species var. variety ‘Cultivar’
Here is an example notation using the above nomenclature for a popular Japanese cultivar called Yabukita:
Camellia sinensis var. sinensis ‘Yabukita’
Breaking apart our sample notation, the genus is Camellia, the species is sinensis, the variety is sinensis, and the cultivar is Yabukita.
However, at times, the variety from which the cultivar came is not known, or may be a hybrid between several varieties. In this case, the following notation is also acceptable:
Camellia sinensis ‘Yabukita’
Some confusion arises with the fact that a cultivar is simply a cultivated variety, meaning that someone has recognized variations in a plant and has cultivated it to maintain these variations. The plant is still a variety, but because we’re cultivating it, we call it a cultivar. We know that in the tea world, cultivars are created from one of the main varieties or hybrids between the main varieties of Camellia sinensis used for tea production: sinensis, assamica, and parvifolia. This is why we sometimes see a variety and a cultivar listed for tea plants — when a plant exhibits variation within a variety, and is cultivated to maintain this variation, we end up with both a variety and a cultivar.
Simply put, varieties are found naturally in the world, once we propagate them for their variance, they become cultivars.
Many popular tea styles are actually processed cultivars with the same name, Tieguanyin and Dahongpao are two examples of this.