Unusual Flavanones from a Rare American Fern

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Abstract
Notholaena fendleri, Polypodiaceae, Farinose Exudate, Novel Flavanone Notholaena fendleri is a rare representative of the genus, growing mainly in Colorado/USA. The white farinose exudate on the lower surface of its pinnules is composed partly of waxy material and partly of flavonoid aglycones. The flavonoid moiety consists mainly of methyl derivatives of the flavanones naringenin and eriodictyol. The eriodictyol methyl ethers are rare compounds; eriodictyol-7 methyl ether is a novel natural flavanone. Three flavones and two flavonols are found as trace constituents only. — The farina flavonoids of N. fendleri form a very typical pattern that is characteristic for this species.

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