Artemisinin, a drug isolated from the sweet wormwood plant artemisia annua, has been in common use to treat malaria.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/garlic-complements-anti-malarial-drug%E2%80%88study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/malaria
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drugs
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-science-iisc
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/western-ghats
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-care
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health