Not sure if this information is available anywhere on the forum at present (haven't found it yet), but came across this while researching lilium hybridisation. It's a table from a book that shows a number of possible species x species hybrids that don't require any special techniques (which I thought would be ideal for me and anyone else who wants to try hybridisation themselves):
Reference: van Tuyl, J.M., Arens, P., Ramanna, M.S., Shahin, A., Khan, N., Xie, S., Marasek-Ciolakowska, A., Lim, K., Barba-Gonzalez R., 2011. Lilium. In: C. Kole, ed., Wild Crop Relatives: Genomic and Breeding Resources, Plantation and Ornamental Crops, Springer-Verlag Berlin Heidelberg. Chapter 9. pp.161-183. Available at <www.liliumbreeding.nl/La%2010565.pdf> [Accessed 15th May 2016].
