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NEW Button animiertQuinone patterns and identification of Japanese Spider Leg Sundews (Drosera Sect. Arachnopus).
Jan Schlauer, Siegfried R. H. Hartmeyer and Irmgard Hartmeyer (2019). Carnivorous Plant Newsletter Vol. 48/4: 161-163.
Keywords: Metabolism, phytochemistry, naphthoquinones, Drosera, chemotaxonomy.

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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 spe-cies  contain  ramentaceone  (7-methyljuglone),  most  contain  the  regio-isomer  plumbagin  (2-meth-yljuglone).  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.

Komiya,  S.,  and  Shibata,  C.  1994.  On  Indian  Sundew,  Drosera  indica  L.  (Droseraceae)  (in  Japa-nese). Bulletin of the Nippon Dental College 23: 125-155.

Makino, T. 1905. Observations on the Flora of Japan. Botanical Magazine (Tokyo) 19: 23-30.

Masamune,  G.  1935.  Beiträge  zur  Flora  von  Südjapan  (IV).  Transactions  of  the  Natural  History  Society of Formosa 25: 11-16.

Ohwi, J. 1965. Flora of Japan (English translation). Washington: Smithsonian Institution.

Schlauer, J., Hartmeyer, S.R.H., and Hartmeyer, I. 2017. Unexpected discovery of 7-methyljuglone (ramentaceone) in several Australian sundews. Carniv. Pl. Newslett. 46: 20-22.

Schlauer, J., Hartmeyer, S.R.H., Hartmeyer, I., Hennern, H., and Hennern, A. 2018. Sundew chemistry and emergence updates. Carniv. Pl. Newslett. 47: 10-17.

Schlauer, J., Hartmeyer, S.R.H., Hartmeyer, I., Hennern, H., and Hennern, A. 2019. New sundew quinone and emergence data. Carniv. Pl. Newslett. 48(1): 6-12.

Watanabe,  M.  2013.  A  New  Species  Unique  to  Japan!  Biodiversity  of  Toyoake’s  Drosera  indica  Understood  (in  Japanese). mikio_140312.pdf (accessed 26 July 2019).