Plants bred for specific characteristics are called cultivars (a cultivated variety). Cultivar names are shown after the species name in roman type, enclosed in single quotes and with initial capital letters. Do not use the abbreviation cv:
Panicum maximum ‘Simuang’ not Panicum maximum cv. Simuang
Viola ‘Penny Black’
A group is a formal category of individual plants and cultivars that share a set of characters. The name of a group consists of the correct genus name plus a lower taxonomic name or common name. Use italics for the taxonomic names, roman for common names and initial capitals for all words in the group name:
Rosa Polyantha Group
Allium cepa Aggregatum Group
