The juice of the roots is an effective antidote in cases of arsenic poisoning. The root also has a folk history of use in the treatment of cancer - extracts from the roots have shown antitumour activity. A tea made from the boiled roots is used as a diuretic. Source: https://pfaf.org/
Daylily
Hemerocallis lilioasphodelus L.
Find more about this plant on Wikipedia.