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 TLC and GLC assay methods employed, forskolin could be detected at levels down to ca. 1 × 10 -4 % 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. Key Word Index Coleus forskohlii - Labiatae - Forskolin - Labdane Diterpenoids.
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Shah et al. (1980) studied this question.