Nice question , can be easily browsed through any search engine. A variety becomes cultivar when it is accepted by growers on a large scale due to consistent performance apart from quality . In another term , a variety becomes cultivar when it occupies large area of cultivation with uniform quality production for commercial use . A variety is plant type having variation in some characteristics , while others are so consistent , develops through a breeding procedure .While species is a collection of plant types having uniformity with respect to different important features form breeding point of view, often helps in developing ideotypes as pre-breeding population. A hybrid comes through segregation of traits from two crossing/breeding parents for inheritance of commercial traits ; though in natural hybridisation , it is not necessary that only superior traits are segregated , every possibility some inferior characters of parents could go into resulting hybrids , can be removed through back crossing.
cultivars are populations adopted by farmers from generation to generation to possess fixed characters over time. Varieties are populations which have undergone selection by geneticists to possess fixed desired characters. import families example in the family of legumes Medicago sativa: Medicago is the genus, Medicago sativa is the species.
Dear @Sachin A J These are basic terms used in plant breeding and economic botany. A variety is a group of individuals that can be morphologically and/or physiologically different from any other such groups within the species. A cultivar is a cultivated variety. Although both cultivar and variety is used synonymously for each other in plant breeding, the former (cultivar) is technically correct, and should be preferred to variety in routin usage. The term "species" refers to group of intermating individuals which are reproductively isolated from any other such groups (this definition applies to sexually reproducing species). A hybrid is an F1 generation derived by crossing genetically dissimilar parents. If the hybrid is commercially cultivated, it may be called a hybrid variety or hybrid cultivar. For understanding further differences amongst the aforesaid terms, you may access:
https://www.researchgate.net/publication/280714722_Glossary_of_Plant_Breeding_A_perspective
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