Anemone caerulea?? But I don't think it's that one.
It would seem there's an article (Enumeration of all the plants known from China proper, Formosa, hainan, The Corea, The Lichu Archipelago, And the island of HongKong; together with their distribution and synonymy) in "Journal of the Linnean Society of London, Botany" Vol 23 Issue 150 in which there's a mention of this plant but I can't open the article on internet.