An interesting exercise proposed by Greg. Of course there are alternate ways of looking of our gardens and this is one of them.
My partial list out of 79 hybridizers, mostly oldies:
Sass 27 [all in family-J, HP, R]
Cayeux 14 [all in family]
EB Williamson 11
Verdier and all Schreiner 10 each
and at 8 each-AJ Bliss, Sir M Foster
Some of my favorites based on other than quantity get tossed to the bottom of the list since they only have a few to their name, or only a few still available.
