Tropidocarpum gracile Hook. in Icon. Pl. 1(1): pl. 43. 1836 sec. Rollins 1993
- =Tropidocarpum scabriusculum Hook. in Icon. Pl. 1(2): pl. 52. 1837 syn. sec. Rollins 1993
- =Tropidocarpum gracile var. scabriusculum (Hook.) Greene, Fl. Francisc. 2: 278. 1891 syn. sec. Rollins 1993
- =Tropidocarpum dubium Davidson in Erythea 2(11): 179-180. 1894 syn. sec. Rollins 1993
- =Tropidocarpum macrocarpum Hook. & Harv. ex Greene in Proc. Acad. Nat. Sci. Philadelphia 47(3): 553. 1895 syn. sec. Rollins 1993
- =Tropidocarpum gracile var. dubium (Davidson) Jeps., Man. Fl. Pl. Calif. [Jepson]: 434. 1925 syn. sec. Rollins 1993