If you are seriously into hybridization, I strongly suggest you read one of the many introductory books on plant breeding and selection now available for home gardeners. These are not university textbooks but reference guides (price-gouging Elsevier is hence not involved), so prices are affordable and in the $90-$25 range. There are also some very good and affordable monographies on breeding popular ornamentals such as Dahlias.
As an aside, apart from heirloom cultivars is anybody aware of an initiative similar to Creative Commons for plants?
