I'm writing a paper on a plant for Biology.  I'd like to know what are some medicinal plants? I'd like at least three suggestions that I can research and I'd like them to  have a significant history in medicine and be in use today. I asked for the suggestions because all the plants I pick someone else in class has picked already

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Peppermint is a medicinal plant that has also been used as a flavoring, such as in candy. However peppermint can help you with stomach aches and digestive problems. So peppermint is not just for Christmas time. It's good all year round for your tummy!
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If you want to get really exotic, coconuts (both the fruit and other parts of the plant) are supposed to have medicinal effects.  Here's a link that includes a lot of references about medicinal purposes for coconuts.

http://www.coconutresearchcenter.org/

One that they don't exactly mention, but which I have seen, is in treating wounds.  I've seen people soak chips cut from a coconut tree in water and then have a person put a wounded hand in there to promote healing and deaden the pain.  I don't know if it's scientifically sound, but that was a folk remedy on the island where I grew up.

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I would research Digitalis lanata from which important arrhythmia drugs are derived. I would also do research on Marijuana as it is currently a hot topic and much information can be obtained. This drug can be used to alleviate nausea in cancer patients and for restoring appetite in many patients and is good for other chronic conditions. I would also research Salix alba, white willow, from which salicylic acid is derived, which is in aspirin. This is a very important drug, with multiple uses.

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Are you near an herb store or Oriental Medicine place? If you are it would be a treasure trove.

Aloe Vera has so many uses, not only in its raw form-yes you can actually break a piece of the plant and use it, but drugstores like Walgreens and CVA sell in in gel form. It has been around a long long time.

Aloe is pretty common, but how about Woodruff, Calendula, Comfrey?

Teas come from plants. You can pick the lessor known ones such as lavender, or go for the common ones such as Chamomile.

You said "plants", but are you including the broader herbs, spices, trees etc; or are you limited to the biologic definition of plants?

You can google "natural remidies with plants" or some such and see what pops up. Or let me know if you need more.

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