subvariety
/ˈsʌbvəˌrʌɪɪti/noun
A subordinate or minor variety, especially of something that may be classified taxonomically, as a domestic animal, a cultivated plant, a language, etc.
Origin
Late 18th century; earliest use found in William Marshall (bap. 1745, d. 1818), agricultural writer and land agent. From sub- + variety, perhaps after French sous-variété.