This study was performed to conduct the pharmacognostic study of Coleus forskohlii Linn. and Rosmarinus officinalis and find larvicidal and phytotoxic effects of these plants. The pharmacognostic parameters for both plants were set out using macroscopic and microscopic methods and the larvicidal and phytotoxic potential was determined using recommended methods. Various pharmacognostic parameters such as stomatal index, palisade ratio, vein islet number and vein termination number were determined for both plants. In the powder drug of both plants, various fragments were detected such as epidermal cells, non-glandular trichomes, and glandular sessile and stalked trichomes, epidermal cells with stomata. Biological activity of ethanolic extract of C. forskohlii and R. officinalis showed that R. officinalis extract is more effective than C. forskohlii againstCulex quinquefasciantus larvae. In case of phytotoxic effect, the effect of R. officinalis was better than C. forskohlii. Both tested plants were found to be phytotoxic and larvicidal.
Key words: Pharmacognostic, Coleus forskohlii Linn., Rosmarinus officinalis Benth.
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