Geranium clarkei (Purple-flowered Group)‘Kashmir Purple’
These are collective names for groups of plants, usually cultivars within a genus that all have similar characteristics. The word Group (written with a capital letter) is always included as part of the plant name, but not with quotation marks, and never written in italics.
Geranium Rambling Robin Group
If a Group name appears with a cultivar name, it is always enclosed within curved brackets.
For example: Geranium clarkei (Purple-flowered Group)‘Kashmir Purple’