A Novel C-Methylated Dihydrochalcone from Pityrogramma triangularis var. viscosa

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Abstract
Pityrogramma triangularis var. viscosa is one of the clear­ly defined varieties within the Pityrogramma triangularis complex. The flavonoid constituents of its frond exudate show a pattern characteristic for this taxon. The major component of the exudate could now be isolated. By spectroscopic methods it has been shown to be 2′,6′,4-trihydroxy,4′-m ethoxy,3′-m ethyl dihydrochalcone, a novel natural compound.