Notes on some genera of the family Poaceae

Critical notes on some genera of the family Poaceae Barnhart (Stipellula Röser et Hamasha, Panicum L., Catabrosa P. Beauv., Poa L.) are given. The genus Stipellula is treated here as monotypic, with the species S. capensis (Thunb.) Röser et Hamasha. The species Panicum maximum Jacq. (widespread in the tropics) takes an unclear posision in the genus Panicum. This species is sometimes included in the genus Urochloa P. Beauv. or treated as a monotypic genus Megathyrsus (Pilg.) B. K. Simon et S. W. L. Jacobs; we include the species in the genus Panicum subgenus Megathyrsus Pilg. We consider a small genus Catabrosa to be closer to the genus Poa than to Puccinellia Parl. Listed for Eurasia are 12 species of Catabrosa. New species Catabrosa kneuckeri Tzvelev (from North Europe), С. longissima Tzvelev (from the Caucasus), C. afghanica Tzvelev (from Afghanistan) and Poa boreorossica Tzvelev (from Leningrad Region) are described. New combinations Catabrosa minor (Bab.) Tzvelev and C. atrata (Tzvelev) Tzvelev are published.