The word for plant root in Lakota is: Oju Wahutah.
colicroot
A radish is a root native to asia.
Root
The Sampson root is a North American prairie native, abundant in the Mid-west
Taro makes poi.
ipecac
An arracacha is a South American plant grown as a root vegetable.
ipecacuanha
Goldenseal
Jicama is a vine, native to Mexico only. Its root is edible and tuberous. The rest of the jicama plant is poisonous and cannot be eaten by either animals or humans.
sweet potato
Look into the journals of Lewis and Clark and you will find that they describe how the native people along the Columbia River offered a drink make from the root of the sassafras plant.