Plebejus argyrognomon (Bergstrasser, 1779) s. l. (= Lycaeides argyrognomon) - Reverdin's Blue.
Range: the temperate Euroasia north to the southern taiga zone, east to E Yakutia and the Magadan Province, Kamchatka, North America.
ssp.: ??mongolicus (Grum-Grshimailo, [1893]) - the mountains of S Siberia, Mongolia
A female on Vicia unijuga R. Br.
Russia, West Siberia, the Altai Mts., Altai Republic, Shebalino District, the Ulus-Cherga village
environs, a herbaceous meadow on southern slope. 8th July 2007. O. Kosterin.