Prenanthes alba L. Nabalus albus, the white rattlesnake-root, also known as Boott's rattlesnake-root[2] or white lettuce, is a plant in the family Asteraceae, native to Canada and the Eastern United States.

[3][4][5] Details of the flower heads are needed to separate this species from others in the rattlesnake-root genus (Nabalus).

The colors vary from blue to purple, pink to red, or white.

[7] White rattlesnake-root is native to Canada and the Eastern United States west into North Dakota, northeast Missouri,[6] and four counties in northwest Arkansas.

[6][8] It is commonly present in Connecticut, Maine, Massachusetts, New Hampshire, and Vermont.