Plants belonging to the Coleus and Plectranthus genera of the Labiatae were semi-quantitatively assayed for the presence of forskolin, a potent cardioactive and hypotensive diterpenoid under development. In the T L C and G L C assay methods employed, forskolin could be detected at levels down to ca. 1 x % of the dry plant material. Coleus forskohlii BRIQ. appears to be unique in that it is the only species among those assayed which was found to contain forskolin.

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