5. Alkanna frigida Boissier (1846: 32) .

Type: — IRAN. Kohgiluyeh and Boyer-Ahmad: Kuh-Daëna, Kotschy 573 (holotype G!, isotype BM!, C!, E!, FI!, GOET!, H!, K!, MO!, P!, US!, W!, WAG!).

Additional specimens examined: — IRAN. Alborz: Kandavan, 36º 5’ N, 51º 11’ E, s.d., Wendelbo & Shirdelpour 11650 (TARI) ; Chaharmahal and Bakhtiari: Lordegan, between Monj & Char-Tagh, Tang-e Zendan, 31º 30’ N, 50º 49’ E, s.d., Mozaffarian 59924 (TARI) ; Isfahan: Semirom, Khafr, Dena Mt., 30º 58’ N, 51º 30’ E, s.d., Riazi 5982 (TARI) ; Ghazvin: Alamut, 36º 31’ N, 50º 28’ E, s.d., Mirfakhrayi 1382 (TARI) ; Semnan: 35 km North of Damghan, Touyeh, 36º 2’ N, 53º 51’ E, s.d., Wendelbo & Assadi 29488 (TARI) ; Tehran: Damavand, Valiran village, 35º 40’ N, 52º 5’ E, s.d., Mozaffarian 32345 (TARI) .