Заметка о Poa pinegensis Roshev. (Poaceae)

Abstract

Poa pinegensis Roshev. was described in 1932 from Arkhangelsk Region (the Northern Dvina River basin), but during the 40 last years it was considered a synonym of P. pratensis L. s. str. New collections from the northern part of Irkutsk Region (Vitimsky Nature Reserve), also from the Ob River (Tyumen Region) allowed us to revise the status of P. pinegensis. In fact, this species indeed belongs to the P. pratensis species aggregate (sect. Poa); however, it has some original morphological characters and thus has to be considered a separate species of hybrid origin, with some influence of P. remota Forselles (sect. Homalopoa Dumort.). The chromosome number in P. pinegensis is determined: 2n = 56. The species occurs in boggy dark coniferous forests and in swampy riverbanks, in the basins of the White (Beloe), Kara (Karskoe) and Laptev (Laptevykh) seas. The closest relative of P. pinegensis is P. raduliformis Prob. (East Siberia, Far East, Mongolia) probably of similar origin.