The only one that I am familiar with is a cross made by Dr. Jacobs of eco-gardens, Decatur GA, between Arisaema sikokianum & A. takedai. The cross produced about 100 seed and the offspring was variable, as would be expected. He named this hybrid A. x sikadaei or a similiar name. If interested, I believe they are available by mail-order. e-mail me for his address, Tel # or e-mail.
Rb

Heronswood had some arisaema crosses listed in his catalog for this year. I bought a wilsonii x griffithii cross. It won't flower this year, am anxious to see the spathe that results.

The cross by Heronswood is very nice, but variable. I purchase a few and have one in flower showing the cross. Eventually the hybrid will get quite large with the A. wilsonii blood in it. It is a good purchase not matter what, because you end up with a Arisaema wilsonii or a A. griffithii if the cross does not show.