Genus Galium (Rubiaceae) in the flora of the Melekessky floristic region of the Middle Volga region

An overview of the genus Galium (Rubiaceae) in the flora of the Melekessky floristic region of the Middle Volga region from the standpoint of the polytypic concept of the species is presented. It was found that the Galium diversity of this area is estimated at 20 species. The status activity of the species in the flora of the Melekessky floristic region, calculated on the basis of its occurrence according to published floristic lists, has been established. Very rarely (species activity from 5.3 to 15.9), 8 species (or 40% of the regional diversity): Galium album Mill .; G. borysthenicum Klokov: G. glabratum Klokov ; G. humifusum M. Bieb.; G. pseudorivale Tzvelev; G. rivale (Sibth. Et Smith) Griseb.; G. rubioides L.; G. trifidum L. Sporadically (species activity from 21.0 to 26.3), 5 species (or 25% of the regional diversity): Galium odoratum (L.) Scop; G. physocarpum Ledeb.; G. triandrum Hyl.; G. uliginosum L.; G. vaillantii DC. Often and very often (species activity from 42, 1 to 78.9), 7 species (or 35% of the regional diversity): Galium aparine L.; G. borea le L.; G. mollugo L.; G. palustre L.; G. ruthenicum Willd ; G. spurium L. G. verum L.