A new Carex L. variety and ten new records from China and Mongolia

A new variety species of Carex humida Y. L. Chang et Y. L. Yan var. orhonensis L.Q. Zhao et Y. Xin, var. nov., discovered in Mongolia, is detailed in this study. The C. humida var. orhonensis var. nov. closely resembles the C. humida, yet it is characterized by significantly denser pubescence on the lower leaf sheaths and bract sheaths (vs the lower leaf sheaths and bract sheaths glabrous or sparsely pilose), and the utricles exhibit sparse hairiness, including the beak orifice (vs utricles hairless or only minimally hairy on both sides of the beak orifice). This species inhabits floodplain environments. In addition, ten newly recorded plant species are reported. These include four species newly recorded from China (Acanthophyllum herniarioides (Boiss.) Madhani & Zarre, Astragalus pseudovulpinus Sanchir ex N.Ulziykh., Carex relaxa V.I. Krecz., Rosularia marnieri (Raym.-Hamet ex H.Ohba) H.Ohba); and six species newly recorded from Mongolia (Delphinium reverdattoanum Polozhij & Revjakina, Echinops dissectus Kitag., Ephedra distachya L., Huperzia appressa (Bach.Pyl. ex Desv.) Á.Löve & D.Löve, Lycium depressum Stocks, and Stellaria bistyla Y.Z.Zhao. Diagnostic features, updated distributions, and detailed illustrations for ten taxa are provided. Voucher specimens are deposited in the Herbarium of Inner Mongolia University (HIMC).