Comment: "Small" is ambiguous. For details on "Small rivers" (e.g. the Salween river) see http://worldwildlife.org/biomes/small-river-ecosystems. This class will be replaced with a less ambiguous class.
Definition: A member of the Green Plants clade, including flowering plants, gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses, charophytes, and chlorophytes. http://eol.org/pages/8654492