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Do you know which Veratrum grows in that area?
http://www.archive.org/stream/floraofjapaninen00oiji/floraofjapaninen00o... this link is old but may be useful
Thanks for the link, going through the key on there it might be V. maackii but I could easily have made a mistake when going through the characters. did a google image search on V. maackii and it came up with a whole range of Veratrums clearly many of the people had wrongly labelled their plants but I did not know which were wrong and which were right.
Lat/Lng: 36.0582, 138.344