Medicinal plants have played an essential role in the development of human culture, for example religions and different ceremonies. Many of the modern medicines are produced indirectly from medicinal plants, for example Aspirin. Plants are directly used as medicines by a majority of cultures around the world, for example Chinese medicine and Indian medicine. Medicinal plants are resources of new drugs. It is estimated that there are more than 250, 000 flowering plant species. Studying medicinal plants helps to understand plant toxicity, protect human and animals from natural poisons.
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