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Leaves of the Geraldton variety of subterranean clover (Trifolium subterraneum L.) have been found to contain kaempferol, quercetin, isorhamnetin, 4′,7-dihydroxyflavonol, fisetin, luteolin, 4′,7-dihydroxyflavone, 3′,4′,7-trihydroxyflavone, isoliquiritigenin and liquiritigenin. Three new compounds, 2′,4,4′-trihydroxy-3-methoxychalcone (homobutein), 4′,7-dihydroxy-3′-methoxyflavone (geraldone) and 4′,7-dihydroxy-3′-methoxyflavonol (geraldol), have also been found and have been synthesized. These flavonoids exist in clover predominantly as glycosides, nine of which have been isolated and characterized by chromatographic and spectrophotometric methods. Five of the glycosides have not been described previously.

Using the methods developed in part I (1), the compounds extracted from the flower petals of the two yellow dahlias “Pius IX” and “Coton” have been examined. As briefly reported earlier (4), 3′,4′,6-trihydroxyaurone was shown to be present in “Pius IX”. The 6-mono- and -diglucosides of this compound were found in “Coton” together with the 7-mono- and -diglucosides of liquiritigenin, the 4-monoglucosides of both butein and 2,4,4′-trihydroxychalcone, and the 4-diglucoside of the last named compound.