phytochemistry of prangos ferulacea (l.) lindl. in one of the habitats of zagros mountain

prangos ferulacea (l.) lindl. (umbelliferae family) is a dominant species in the some partial of habitats in zagros mountains. according to ethno-botanical studies, this plant is one of the best range plants of iran. local ranchers collect green prangos while it is toxic. they then dry the plant and use it to feed their livestock, especially in winter season. this research done to analyse the changes in the chemical composition of pr. ferulacea with the effects of time, location and type of secondary metabolisms. therefore, the ingredients and amounts of the essential oils of prangos were studied during the growing and flowering stages (in both green/fresh and dried forms) to track such changes. the results showed that the amounts of terpinolene, β-phellandrene and bornyl acetate were decreased in the dried form, and some of the harmful components, such as α-pinene, β-pinene, myrcen and delta-3-carene, were absent, rendering the plant non-toxic. these results confirm the opinion of the ranchers. in the growing stage, the amount of coumarin was significantly less than in the flowering stage, which also supports the conduct of the local ranchers who gather the plants at the most appropriate time.