According to a study conducted by the World Health Organization (WHO) based on publications on pharmacopoeias and medicinal plants in 91 countries, the number of medicinal plants is nearly 21,000. Nearly 6-7 thousand species of medicinal plants out of about 17-18 thousand flowering plants are known to be in use in folla and officially recognized systems of medicine in India i.e. Ayurbeda, Sidha, Unani and Homeopathy.
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