Abstract
From the stem and root barks of Merrillia caloxylon (Rutaceae) the dimeric indole alkaloid yuehchukene has been isolated together with a simple prenylated indole, the 8-prenylated coumarins sibiricin and phebalosin, and the polyoxygenated flavonoid, eupatorin. The finding of these three classes of metabolites in Merrillia strongly supports Swingle in his proposal that this taxon is closely allied to Murraya paniculata, a member of Murraya section Murraya. The possible significance of these findings for the phylogeny of the tribe Clauseneae is explored and their implications for predicting the potential distribution of yuehchukene in the Aurantioideae is discussed.
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