Petrorhagia thessala (Boiss.) P. W. Ball & Heywood in Bull. Brit. Mus. (Nat. Hist.), Bot. 3: 156. 1964
Petrorhagia thessala in Bull. Brit. Mus. (Nat. Hist.), Bot. 3: 156. 1964
is new combination for Tunica thessala, Diagn. Pl. Orient. 8: 63. 1849
Petrorhagia thessala in Bull. Brit. Mus. (Nat. Hist.), Bot. 3: 156. 1964