The Virex variety belongs to the butterhead lettuce (kropsla, Butterhead) type. The name was first recorded in a 1980 Dutch variety reference book, where the company Huizer was listed as the supplier.
In modern scientific publications, the variety is mentioned as a specimen of butterhead lettuce used for studying plant circadian rhythms; however, detailed agronomic characteristics or data on its current commercial status are absent from open sources.
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Countries of admission
1 jurisdiction
Green indicates countries where the variety is listed in the national catalogue and its seeds are authorized for sale. Expired registrations are marked separately: the variety was previously admitted, but sale is no longer permitted.
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