Spider Leg Sundews of Japan - Chemistry, Morphology and Identification by Jan Schlauer

This video is a recording from our 13th ICPS International Conference. It was held at the Himeji Citizens Hall in Himeji City, Japan, May 26-28, 2023. The conference was hosted by the Japanese Carnivorous Plant Society (JCPS) with the cooperation of the Kansai Carnivorous Plant Society (KCPS), the Tokai Carnivorous Plant Society (TCPS) and the Hiroshima Carnivorous Plant Society (HCPS).
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Spider Leg Sundews of Japan - Chemistry, Morphology and Identification by Jan Schlauer
Abstract: The Japanese sundews that have previously been collectively called D. indica L. (especially after the influential Flora of Japan, Ohwi 1965:492) are being split up. Various authors (e.g., Watanabe 2013) are trying to re-establish or create one or two additional species assumed endemic to Japan, following the contemporary trend to recognize a number of segregate taxa in Drosera sect. Arachnopus (Greek for “spider leg”), the group that contains D. indica. Previous research (Schlauer et al.
2017, 2018, 2019) has demonstrated a rather unexpected diversity in the naphthoquinones that are characteristic for the different species now recognized in this group. While a few Australian species contain ramentaceone (7-methyljuglone), most contain the regio-isomer plumbagin (2-methyljuglone).
So far, only D. indica s.str. (accessions from Asia and Africa have been investigated) contains both isomers in the same plant. The morphological diversity found in Japan thus prompted a chemical investigation, the results of which are reported here.
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