Contrasting Dihydronaphthoquinone Patterns in Closely Related Drosera (Sundew) Species Enable Taxonomic Distinction and Identification

Dihydronaphthoquinones are described as constituents of sundews (Drosera), Venus flytraps (Dionaea), and dewy pines (Drosophyllum) for the first time. As in the corresponding naphthoquinones, these reduced derivatives may occur in two regio-isomeric series distinguished by the relative position of a methyl group (at position 2 or 7 in the naphthalene skeleton), depending on the taxon. Species producing plumbagin (2-methyljuglone, 1) do commonly contain the corresponding dihydroplumbagin (5), while species containing ramentaceone (7-methyljuglone, 2) also contain dihydroramentaceone (7-methyl-β-dihydrojuglone, 6). So far, only few species containing plumbagin (1) and dihydroplumbagin (5) additionally form dihydroramentaceone (6) but not ramentaceone (2). Thus, subtle but constant differences in the chemism of closely related and morphologically similar species reliably define and distinguish taxa within D. sect. Arachnopus, which is taken to exemplify their chemotaxonomic utility. The joint presence of quinones and hydroquinones allows observations and predictions on the chemical structures and the reactions of these intriguing natural products

Neue und alte Styeliden aus der Sammlung des Berliner Museums

Volume: 8Start Page: 203End Page: 23

Die Ascidien der Arktis

Volume: 3Start Page: 93End Page: 41

Alder und Hancock\u27s Britische Tunicaten. Eine Revision

Volume: 7Start Page: 303End Page: 34

Ein Beitrag zur Kenntnis der japanischen Ascidienfauna

Volume: 31Start Page: 1End Page: 3

Snap-tentacles and runway lights: Summary of comparative examination of Drosera tentacles

Volume: 39Start Page: 101End Page: 11

Miscellanea Ascidiologica

Volume: 10Start Page: 299End Page: 32

Nachtrag zu Monascidien von Ternate

Volume: 25Start Page: 235End Page: 24