There were 2 illustrations found for R. Gay
6 92940 Artemisia thuscula Cav.P.B. Webb, S. Berthelot, Hist. Nat. Iles Canaries, vol. 2(2): : p. 303, t. 100 (1836) [J.C. Heyland & R. Gay]
2 91315 Artemisia arragonensis Auct.P.B. Webb, S. Berthelot, Hist. Nat. Iles Canaries, vol. 2(2): : p. 300, t. 101 (1836) [J.C. Heyland & R. Gay]