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Lactuca canadensis L. (wild lettuce)
The juice was rubbed on warts.
Larix laricina (Du Roi) Koch. (tamarack)
The inner bark, dried or fresh, was chopped up and applied to burns.
Lathyrus venosus Muhl. (wild pea)
Used the root, dried and powdered along with, Apocynum androsaemifolium L. (dogbane) which the root from was also used, to treat convulsions.
Wild pea was also used for wounds. The root was boiled and used as a poultice externally, it was said to act as an emetic if blood from a wound had accumulated inside a patient (Densmore 1974).
Another use of this plant was as a tonic or stimulant. The root was made into a decoction and drank. Apparently one dose had no effect, but was effective after taking a larger quantity.Ledum groenlandicum Oeder. (labrador tea)
The root was dried and powdered, mixed with root of wild cherry, and applied dry to burns or ulcers.
Leptandra virginica (L.) Nutt. (culver’s root)
The root was mixed with water and drank. For the physic, and also said to cleanse the blood. The root was mixed with the inner bark of chokecherry and water, and drank in small doses for scrofula, it is mildly cathartic.
Liatris aspera Michx. (blazing star)
The leaves and corm were boiled together and drunk for diarrhea in children.
Lilium canadense L. (lily)
The root was mixed with water and applied to snake bites.
Lilium umbellatum Pursh.
Flowers were pulverized or chewed, and applied to bite of a poisonous brown spider.
Lygodesmia juncea (Pursh) D.Don. (skeleton weed)
The stems were made into a poultice for sore eyes. Mothers drank this to increase milk flow.