Gentianella quinquefolia

Gentianella quinquefolia (L.) Sm.
Engl.: stiff gentian, ague weed, agueweed, five-flowered gentian, gall-weed.
Bot. syn.: Amarella amarelloides (Michx.) Greene, Gentiana amarelloides Michx., Gentiana quinqueflora Christm., Gentiana quinquefolia L.