Abstract

The major alkaloids of 12 species of the genus Melolobium Eckl. & Zeyh. have been characterized. Variable quantities of anagyrine, camoensine, leontidine, lupanine, N -methylcytisine and thermopsine are present in nearly all of the extracts. Sparteine, cytisine and some unidentified alkaloids occur less frequently. If one species [ Melolobium involucratum (Thunb.) Stirton] is excluded, the genus is morphologically very uniform and also appears to be uniform in its alkaloidal metabolites. Within the tribe Crotalarieae, the combination of thermopsine and the two C 14 alkaloids leontidine and camoensine may prove to be a unique chemotaxonomic character for Melolobium.

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