国際藻類・菌類・植物命名規約
taxonomic rank of "variety" (regulated by the "International Code of Nomenclature for algae, fungi, and plants"), nor with the term "cultivar" (regulated by the "International Code of Nomenclature for Cultivated Plants"). Some horticulturists use "variety" imprecisely; for example, viticulturists almost always refer to grape cultivars as "grape varieties".