Calamagrostis are described from the Russian Far East. Chromosome numbers are reported for two new taxa. Calamagrostis burejensis Prob. et Barkalov, 2n = 28 (sect. Calamagrostis), C. zejensis Prob., 2n = 28 (sect. Deyeuxia), and C. × amgunensis Prob. (C. amurensis Prob. × C. neglecta (Ehrh.) G. Gaertn., B. Mey. et Scherb. s. l.) are described from the Amur River basin (Amur Region or Khabarovsk Territory); Arundinella rossica Prob. (sect. Hirtae) and Calamagrostis kozhevnikovii Prob. et Prokopenko (sect. Calamagrostis) from Primorye Territory.