Phacelia dubia (L.) Trel. Phacelia dubia (L.) Trel. in Rep. (Annual) Arkansas Geol. Surv. 4: 205. 1888 [1891]. 1891 ["1888"] sec. Ulloa Ulloa & al. 2018=Phacelia parviflora Pursh, Fl. Amer. Sept. 1: 140–141. 1813 syn. sec. POWO 2019