Under the ICNCP, a Cultivar Group is a gathering of cultivars. There may be several reasons to designate a group, for example a group of yellow-flowering cultivars, a group of cultivars with variegated leaves, a group of cultivars resistant to a particular disease, etc. A cultivar may belong to more than one Cultivar Group (it may be yellow-flowering, with variegated leaves and resistant to the disease at one and the same time). This Osteospermum Pink Whirls is a successful cultivar. ...
ICNCP Art 9 Ex 10: "Solanum tuberosum 'Desiree' may be designated part of a Maincrop Group and a Redskin Group since both such designations may be practical to buyers of potatoes ..."
Another reason for designating a group is when a wellknown plant loses its taxonomic status (e.g. it ceases to be a "good" species or subspecies and becomes a synonym). Its botanical epithet may become a "Group epithet".
For the technical details of how to write a group name see cultivar. This Osteospermum Pink Whirls is a successful cultivar. ...
Cultivar names before 1 January 1959 were often given in Latin form and can be readily confused with names of botanical taxa, but after that date, must be in a modern vernacular language to distinguish them from botanical names.
Cultivars that are still being developed and not yet ready for release to seed companies often are coded with letters (signifying the university or other organization working on the variety) and numbers.
Cultivars that have originated as hybrids of different species are exotic, as is a plant from a different continent.
Cultivar names consist of the name of the denomination class (Latin genus name) plus a cultivar epithet (in a modern language) in single quotation marks.
The cultivar name of a plant which is a member of a cultivar-group is properly given by including the cultivar-group name in parentheses before or after the cultivar epithet.
Furthermore, by accepting a cultivar or cultivar-group name, the Registrar is not conferring any implied judgement upon the value of the plant as a horticultural entity.
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