Carex

A large genus commonly named sedges, it included ca. 2000 spp A so specious group deserves splitting as Kukenthal (1909) did including Carex, Kobresia Willd., Schoenoxiphium Nees, and Uncinia Pers. Nevertheless, phylogeny says there are no so many monophyletic taxa to be sampled. Egorova, does phylogenetics considerations; in the same vein she added (subgenus Kreczetoviczia Egor. Trichophorum Pers. ). Restudy genus Kobresia as polyphyletic (here as Carex sanguinea) the open perigynia of Kobresia evolved several times from the ancestral closed utricle.

GBIF
Carex sanguinea Boott (Kobresia  ) Trichophorum cespitosum (L.) Hartm.