- rattlesnake root, Prenanthes purpurea - herb of central and southern Europe having purple florets
--1 is a kind of herb, herbaceous plant
--1 is a member of Prenanthes, genus Prenanthes - rattlesnake root - a plant of the genus Nabalus
--2 is a kind of herb, herbaceous plant
--2 is a member of Nabalus, genus Nabalus
--2 has particulars: white lettuce, cankerweed, Nabalus alba, Prenanthes alba