Photos of Iris cristata, Dwarf Crested Iris
Iris cristata, Dwarf Crested Iris, according to C.S. Rafinesque in his Medical Flora (Vol. 2, page 232, 1830), "The root of Iris cristata [is] cathartic when fresh the taste is sweet at first, but next burning like Capsicum, the leaves used to alleviate thirst." He quotes Frederick Pursh who made the obersvation in 1814, adding, "The hunters of Virginia, notwithstanding those properties, use it very frequently to alleviate thirst." Flora Americae Septentrionalis, Vol. 1, 1814.
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