Similarly, in MDCK cells extracts of Artemisia caruifolia, D. brunonianum and E. longifolia showed strong toxicity with CC 50 ranging from 19 to 25 mg ml À1 . A moderate toxicity was exhibited by the extracts of A. strigilosa, A. rivularis, Asparagus filicinus, Dicranostigma lactucoides, Hyoscyamus niger, Thymus linearis and Zanthoxylum armatum with CC 50 ranging from 30 to 50 mg ml À1 . Other three extracts demonstrated very low toxicity while rest of the extracts were non-toxic at 100 mg ml À1 .