He has conducted extensive botanical expeditions in Central Asia between 1928 and 1932, in Kamchatka in 1935 and in the Urals between 1921 and 1927 . As well as the Sino-Soviet expedition to Yunnan in 1956–1957 with scientists like Andrei Fyodorov, Moissey Kirpitchnikov and zoologists as VVPopov and entomologist Oleg Kryjanovski.