Introduction:
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.
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References:
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).
https://www.aichi-edu.ac.jp/intro/files/rikakyoiku_watanabe
mikio_140312.pdf (accessed 26 July 2019).
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Quinone patterns and identification of Japanese Spider Leg Sundews (Drosera Sect. Arachnopus).