Hypericum ascyron L., Great St.Johnswort, ranges in N Asia and N America.

A damp meadow on the Budyumkan River right floodland 5 km of its confluence with the Argun' River 6 km S of the village Uryupino, Gazimurskozavodskoi District, E Chita Province, E Transbaikalia, Siberia, Russia. 26th July 1997. O. Kosterin.