cultivars and herbarium specimens

The identification of taxa from cultivar specimens is more difficult than from wild forms. Cultivars were selected because of a special character state, which sometimes the natural species does not possess. These character states generate a huge problem for the identification, they are marked in the notes. Anyway, the identification of many cultivars is also possible with a limited number of characters.
It is the same with herbarium specimens, you can also identify them with a limited number of characters.