The miniature species first used in downsizing the flowers and the plant size was Cym pumilum, syn floribundum. However, many of the first generation hybrids were not genetically vigorous and resulted in dead end crosses.
Some hybridizers are currently using Cym. devonianum but although these tend to give a much improved flower count, a small flower and shorter leaves, the species itself is pendent and as such, most of the hybrids are too.
An interesting read is Stephen Early's website on the species with how and where they grow and some comments on their use in hybridizing.
Last edited by Cym Ladye; 09-19-2015 at 12:03 PM..
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