1. O. E. Knorring, Flora of the USSR [in Russian], Vol. 21, Izd. Akad. Nauk SSSR, Moscow, Leningrad, 1954, pp. 194–237.
2. L. Fu and T. Hong (eds.), Higher Plants of China, Vol. 9, Qingdao Publ. House, Qingdao, 1999, pp. 492–497.
3. V. N. Voroshilov, Flora of the Soviet Far East [in Russian], Nauka, Moscow, 1966, p. 478.
4. V. N. Voroshilov, Floral Research in Various Regions of the USSR [in Russian], Moscow, 1985, pp. 139–200.
5. T. V. Krestovskaya, Vascular Plants of the Soviet Far East [in Russian], Vol. 7, Nauka, Leningrad, 1995, pp. 343–345.