November 28, 2021
Variety in botany (henshu, English: variety, Latin: varietas) is one of the classes in botanical classification defined by the botanical nomenclature. It is abbreviated as "var." After the scientific name written in the Binomial nomenclature. The International Union for the Protection of New Plant Species treats the term variant as a legal term.
Under the International Code of Zoological Nomenclature, only subspecies are allowed for the class attached to the end of the species nomenclature, and the class of varieties is not allowed.
Varieties are distinguished from other varieties of the same plant species, but crosses are possible between different varieties. However, the ecological characteristics and favorable environment may differ between the varieties, and in that case, the distribution areas may not overlap, making it difficult for crosses to occur. For example, the three varieties of barnyardgrass, barnyardgrass, and barnyardgrass grow according to wet conditions. Each variety may have significantly different ecological characteristics, such as adaptability to coexist with rice.
In addition, if two varieties grow sympatrically and it is considered that reproductive isolation has occurred, it may be considered that the varieties are upgraded to species. For example, Chrysosplenium japonicum, which belongs to the genus Chrysosplenium, is treated as a variety of Chrysosplenium chinensis of the same genus, but it is suggested that it should be treated as a different species due to the fact that it grows sympatrically and the remarkable difference in morphological characteristics. ..
Utilization of variants
Some varieties are very important as crops. For example, the cruciferous rapa is considered to be the original species of many cultivated plants, and many important crop plants such as oilseed rape, turnip, komatsuna, bok choy, and Chinese cabbage are known as its variants.
Biological classification unit of scientific name