Variation pattern in the composition of essential oil, hydrodistilled from the over‐matured flower heads of Echinacea purpurea (L.) Moench under subtropical climate was characterized by GC–MS and GC analysis. The plants flower from June till December and climatic factors such as temperature and humidity were found to affect both the content and the composition of the essential oil.
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Thappa et al. (2004) studied this question.
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