>> Given the thought that they are closely related, has anyone produced a
>> hybrid from these plants?
>
> I rather doubt D.prolifera and D.adelae can hybridize. However,
>D.prolifera and D.schizandra both the same number of chomsomes so
>these two stand a much better chance of crossing while D.adelae
>has the differing number.
Kondo has reported both 2n=28 and 2n=30 for D.adelae. It wasn't
specified, but maybe these two numbers represent the two different forms
known in cultivation (red and salmon-colored flowers).
Best Wishes,
Fernando Rivadavia
Tokyo, Japan