Cousinia Cass. is one of the widespread genera of Asteraceae family. There is a large number ofpharmacological activity studies on this genus and it has not yet been examined phytochemically in detail. Pseudo taraxasterol (ψ-taraxasterol) is a pentacyclic triterpene with different pharmacological activity such as antinociceptive, anti-inflammatory. In this report, we aimed to evaluate the ψ-taraxasterol content, which isolated from C. stenocephala in seven Cousinia species by highperformance liquid chromatography-photodiode array detector (HPLC-PDA) method. According to quantitative analyses the highest content of ψ-taraxasterol was detected in C. davisiana, C. stenocephala, and C. ramosissima extracts (0.423±0.004, 0.395±0.004 and 0.374±0.000 g/100gextract, respectively). This is the first report on the quantification of pseudo taraxasterol by HPLC-PDA method in this genus, and this result will shed new lights on the advanced biological activity studies on species of this genus.
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