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Hi Helen,I know someone in Japan who grows this clematis. He imported both plants and seeds from Taiwan this year. He was saying that because this clematis was native to Taiwan, it would be fine with hot summers, but he wasn't sure how cold hardy it would be. I can ask him where he got his seeds if you are interested. C. akoensis Hayata is "屏東鐵線蓮" in Chinese; if you put this into google image search "屏東鐵線蓮" you can come up with lots of beautiful pictures (assuming your computer recognizes the characters).
Currently a breeding program is undertaken for ex situ propagation.
Hi Pascal, do you know if they are using this clematis to breed something new? Or are they propagating to increase the number of plants? It would be interesting to see how they might use this clematis to breed new cultivars. Although C. akoensis Hayata is very rare even in Taiwan, I have seen someone who was showing off their C. akoensis Hayata which came from nursery stock on a Taiwanese forum. The person was happy to trade seeds or cuttings, so in Taiwan, I think it's possible that some nurseries are propagating this species and that it is available to the public.
Your point about establishing pure species in cultivation is valid, of course but from the gardeners' point of view, the possibility of introducing hybrid vigour to a plant that is scarce and perhaps tricky to grow, to enable it to be more available and more amenable to cultivation is understandably tempting.