= Carum cordatum (Walter) Alph.Wood; Amer. Bot. Fl. 138 (1870)
= Smyrnium atropurpureum Lam.; Encycl. [J.Lamarck et al.] 3: 667 (1792)
= Smyrnium cordatum Walter; Fl. Carol. [Walter] 114 (1788)
= Smyrnium trifoliatum (L.) Muhl. ex Nutt.; Gen. N. Amer. Pl. [Nuttall] 1: 195 (1818)
= Thapsia trifoliata L.; Sp. Pl. [Linnaeus] 1: 262 (1753)
= Thaspium atropurpureum (Desr.) Nutt.; Gen. N. Amer. Pl. [Nuttall] 1: 196 (1818)
= Thaspium aureum var. apterum A.Gray; Manual [A.Gray], ed. 2: 156 (1856)
= Thaspium aureum var. atropurpureum (Nutt.) J.M.Coult. & Rose; Bot. Gaz. 12: 136 (1887)
= Thaspium aureum var. cordatum Britton, Sterns & Poggenb.; Prelim. Cat. 22 (1888)
= Thaspium aureum var. involucratum J.M.Coult. & Rose; Rev. N. Amer. Umbell. 83 (1888)
= Thaspium aureum var. trifoliatum (L.) J.M.Coult. & Rose; Bot. Gaz. 12(6): 136 (1887)
= Thaspium cordatum var. atropurpureum (Nutt.) Alph.Wood; Class-book Bot. (ed. 2a): 289 (1847)
= Thaspium purpureum Walp.; Ann. Bot. Syst. [Walpers] 2: 702 (1852)
= Thaspium sylvaticum (Benke) G.N.Jones; Amer. Midl. Naturalist, Monogr. 2: 197 (1945)
= Thaspium trifoliatum Britton; Mem. Torrey Bot. Club 5: 248 (1894)
= Thaspium trifoliatum f. atropurpureum (Nutt.) Farw.; Rep. (Annual) Michigan Acad. Sci. 21: 369 (1920)
= Thaspium trifoliatum var. atropurpureum (Nutt.) A.Gray; Manual [A.Gray], ed. 2: 156 (1856)
= Thaspium ziziopsis Daniels; Univ. Missouri Stud., Sci. Ser. 1(2): 187 (1907)
= Upopion cordatum (Walter) Raf.; New Fl. [Rafinesque] 4: 31 (1838)
= Upopion heterophylum Raf.; New Fl. [Rafinesque] 4: 31 (1836)
= Upopion pinnatum Raf.; New Fl. [Rafinesque] 4: 30 (1836)
= Upopion trifoliatum (L.) Raf.; New Fl. [Rafinesque] 4: 30 (1836)
= Zizia parvifolia Raf.; New Fl. [Rafinesque] 4: 31 (1836)
= Zizia sylvatica Benke; Rhodora 35: 45 (1933)