I didn't find in Dr. Duke's database, any information about the uses of Dahlia coccinea
Here is some basic information about Dahlia coccinea.
Dahlia coccinea basic info
Scientific Name: Dahlia coccinea Cav..
Dahlia coccinea is native to Mexico but has long been cultivated in other countries for its showy flowers. The tubers of the plant are highly nutritious and they were used as a food source by the Aztecs, though this use largely died out after the Spanish conquest. - for more info about Dahlia coccinea See link
Dahlia coccinea in other websites
Dahlia coccinea common names, economics importance, distributional range and more in the USDA GRIN website - See link
Search PubMed (US National Library of Medicine National Institutes of Health) for academic researches with the search term Dahlia coccinea - See link
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