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Planta Med 1988; 54(6): 542-546
DOI: 10.1055/s-2006-962543
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© Georg Thieme Verlag Stuttgart · New York

Epicuticular Flavonoids from Encelia (Asteraceae)

Peter Proksch1 , Ursula Politt2 , Eckhard Wollenweber3 , Victor Wray4 , Curtis Clark5
  • 1Institut für Pharmazeutische Biologie der Technischen Universität, Mendelssohnstr. 1, D-3300 Braunschweig, Federal Republic of Germany.
  • 2Botanisches Institut der Universität zu Köln, Gyrhofstr. 15, D-5000 Köln 41, Federal Republic of Germany.
  • 3Institut für Botanik der Technischen Hochschule Darmstadt, Schnittspahnstr. 3, D-6100 Darmstadt, Federal Republic of Germany.
  • 4Gesellschaft für Biotechnologische Forschung mbH, Mascheroder Weg 1, D-3300 Braunschweig, Federal Republic of Germany.
  • 5Biological Sciences, California State Polytechnic University, Pomona, California 91768, USA.
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Publication History

1988

Publication Date:
24 January 2007 (online)

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Abstract

Most of the species of the North American genus Encelia have been analysed for lipophilic flavonoids present as constituents of the resins secreted on the surfaces of leaves and stems. Thirty different flavonoids have been isolated and identified. The compounds included several new and unusual flavanones mainly based on pinocembrin, naringenin, and eriodictyol. The structural elucidation of these compounds by spectroscopic means is described. The flavonoid patterns are briefly discussed with regard to the systematics of Encelia.