''Nabalus trifoliolatus'' (syn. ''Prenanthes trifoliolata''), the gall-of-the-earth or three-leaved rattlesnake root, is a species of flowering plant in the family Asteraceae, native to eastern Canada and the eastern United States. It is a perennial reaching .

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trifoliolatus Flora of Eastern Canada Flora of the Northeastern United States Flora of Kentucky Flora of Virginia Flora of Maryland Flora of Tennessee Flora of North Carolina Flora of South Carolina Flora of Georgia (U.S. state) Plants described in 1825 {{Cichorieae-stub