• Bolboschoenus maritimus (L.) Palla, Salt-marsh bulrush, Cosmopolitan bulrush, Synonyms: Scirpus maritimus L. var. paludosus (A. Nelson) Kükenthal, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex albonigra Mack., Black-and-white sedge, Black-and-white scaled sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex aquatilis Wahlenb., Water sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex arapahoensis Clokey, Arapaho sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex atherodes Spreng., Awned sedge, Wheat sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex athrostachya Olney, Slenderbeak sedge, Slender-beak sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex atrosquama Mack., Dark-scaled sedge, Lesser blackscale sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex aurea Nutt., Golden sedge, Golden-fruit sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex backii Boott, Back's sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex bebbii (L.H.Bailey) Olney ex Fernald, Bebb's sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex bella L.H.Bailey, Beautiful sedge, Showy sedge, Southwestern showy sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex brevior (Dewey) Mack., Shortbeak sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex brunnescens (Pers.) Poir., Brownish sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex buxbaumii Wahlenb., Buxbaum's sedge, Brown bog sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex canescens L., Gray sedge, Silvery sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex capillaris L., Hair sedge, Hairlike sedge, Hair-like sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex chalciolepis T. Holm, Holm's sedge, Synonym: Carex atrata L. var. chalciolepis (T. Holm) Kük., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex crawei Dewey, Crawe's sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex deflexa Hornem. var. bootii L.H. Bailey, Boot's sedge, Synonym: Carex brevipes W. Boott, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex deweyana Schwein., Dewey sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex diandra Schrank, Lesser panicled sedge, Lesser tussock sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex disperma Dewey, Soft-leaved sedge, Softleaf sedge, Soft-leaf sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex douglasii Boott, Douglas' sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex duriuscula C.A.Mey., Needleleaf sedge, Synonym: Carex stenophylla Wahlenb., Native, Common, Photos Phytoimages, USDA_Plants

• Carex ebenea Rydb., Ebony sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex echinata ssp. echinata Murray, Star sedge, Synonym: Carex angustior Mack., Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex egglestonii Mack., Eggleston's sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex elynoides Holm, Blackroot sedge, Black-root sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex emoryi Dewey, Emory's sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex engelmannii L.H.Bailey, Engelmann's sedge, Synonyms: Carex breweri Boott var. paddoensis (Suksd.) Cronquist, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex epapillosa Mack., Different-nerve sedge, Synonyms: Carex atrata L. ssp. epapillosa (Mack.) F.J. Herm., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex exsiccata L.H. Bailey, Western inflated sedge, Native, Grand Co., Photos Phytoimages, USDA_Plants

• Carex filifolia Nutt., Threadleaf sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex fuliginosa Schkuhr, Short-leaved sedge, Synonym: Carex misandra R. Br., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex geophila Mack., Ground-loving sedge, White Mountain sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex geyeri Boott, Geyer's sedge, Elk sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex hallii Olney, Deer sedge, Synonyms: Carex parryana Dewey ssp. hallii (Olney) D.F. Murray, Carex parryana Dewey var. hallii (Olney) Kükenthal, Carex parryana Dewey var. unica L.H. Bailey, C. elrodii M. E. Jones, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex haydeniana Olney, Hayden's sedge, Cloud sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex heteroneura W. Boott, Different-nerve sedge, Holm's sedge, Synonym: Carex atrata L. var. erecta W. Boott, Native, Common, Photos Phytoimages, USDA_Plants

• Carex hoodii Boott, Hood's sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex hystericina Muhl. ex Willd., Bottlebrush sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex illota L.H.Bailey, Sheep sedge, Smallhead sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex incurviformis Mack., Incurved sedge, Native, Grand Co., Photos Phytoimages, USDA_Plants

• Carex inops ssp. heliophila (Mack.) Crins, Sun sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex interior L.H.Bailey, Inland sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex jonesii L.H.Bailey, Jones' sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex lachenalii Schkuhr, Two-parted sedge, Two-tipped sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex lenticularis Michx. var. lipocarpa (T. Holm) L.A. Standl., Lens sedge, Kellogg's sedge, Native, Jackson Co., Photos Phytoimages, USDA_Plants

• Carex leptalea Wahlenb., Bristlestalked sedge, Bristly-stalk sedge, Bristlystalked sedge, Native, Rare, Photos Phytoimages, USDA_Plants

• Carex limosa L., Mud sedge, Native, Rare, Photos Phytoimages, USDA_Plants

• Carex livida (Wahlenb.) Willd., Livid sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex macloviana d'Urv., Brown sedge, Falkland island sedge, thickhead sedge, Synonym: Carex subfusca W. Boott, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex magellanica ssp. irrigua (Wahlenb.) Hultén, Little sedge, Boreal bog sedge, Synonym: Carex paupercula Michx., Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex microglochin Wahlenb., Small-tipped sedge, Few-seeded bog sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex micropoda C. A. Mey, Pyrenean sedge, Synonyms: Carex pyrenaica ssp. micropoda (C.A. Mey.) Hultén, Carex pyrenaica ssp. pyrenaica Wahlenb., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex microptera Mack., Small-winged sedge, Oval-head sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex misandra Schkuhr, Shortleaved sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex nardina Fries, Spikenard sedge, Spike sedge, Hepburn's sedge, Synonyms: Carex nardina Fr. ssp. hepburnii (Boott) Á. Löve & D. Löve & Kapoor, Carex nardina var. hepburnii (Boott) Kük., Carex hepburnii Boott, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Carex nebrascensis Dewey, Nebraska sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex nelsonii Mack., Nelson's sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex neurophora Mack., Alpine nerve sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex nigricans C.A.Mey., Black alpine sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex norvegica Retz., Norway sedge, Scandinavian sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex nova L.H.Bailey, Black sedge, New sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex obtusata Lilj., Obtuse sedge, Blunt sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex occidentalis L.H.Bailey, Western sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex oreocharis Holm, Grassyslope sedge, Native, Rare, Photos Phytoimages, USDA_Plants

• Carex pachystachya Cham. ex Steud., Chamisso sedge, Thickhead sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex parryana Dewey, Parry's sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex paysonis Clokey, Payson's sedge, Not reported for Colorado in Flora North America but see Ackerfield (2015, p. 326), Native, Jackson Co., Photos Phytoimages, USDA_Plants

• Carex peckii Howe, Peck's sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex pellita Muhl. ex Willd., Woolly sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex pelocarpa F.J. Herm., Duskyseed sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex perglobosa Mack., Globe sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex petasata Dewey, Liddon sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex phaeocephala Piper, Dunhead sedge, Dunehead sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex pityophila Mack., Loving sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex praeceptorum Mack., Early sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex praegracilis W.Boott, Clustered field sedge, Slim sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex praticola Rydb., Meadow sedge, Northern meadow sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex raynoldsii Dewey, Raynolds' sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex rossii Boott, Ross' sedge, Ross's sedge, Short-stemmed sedge, Synonym: Carex brevipes W. Boott, Native, Common, Photos Phytoimages, USDA_Plants

• Carex rupestris All., Curly sedge, Drummond sedge, Synonyms: Carex rupestris ssp. drummondiana (Dewey) L.H. Bailey, Carex drummondiana Dewey, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex sartwellii Dewey, Sartwell's sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex saxatilis L., Rock Sedge, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Carex saximontana Mack., Rocky Mountain sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex scirpoidea Michx., Northern single-spike sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex scoparia Willd., Broom sedge, Pointed broom sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex scopulorum Holm, Cliff sedge, Holm's Rocky Mountain sedge, mountain sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex siccata Dewey, Dry sedge, Dryspike sedge, Synonym: Carex foenea Willd., Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex simulata Mack., Analogue sedge, Shortbeak sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex sprengelii Dewey ex Spreng., Sprengel's sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex stenoptila F.J.Herm., Riverbank sedge, Not reported for Larimer county in Ackerfield (2015), Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex stevenii (T. Holm) Kalela, Steven's sedge, Norway sedge, Synonym: Carex norvegica ssp. stevenii (T. Holm) A.E. Murray, Native, Common, Photos Phytoimages, USDA_Plants

• Carex stipata Muhl. ex Willd., Awlfruit sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex sychnocephala Carey, Manyhead sedge, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Carex tahoensis Smiley, Tahoe sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Carex torreyi Tuck., Torrey's sedge, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Carex utriculata Boott, Beaked sedge, Northwest Territory sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex vallicola Dewey, Valley sedge, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Carex vernacula L.H.Bailey, Native sedge, Spring sedge, Native, Common, Photos Phytoimages, USDA_Plants

• Carex vesicaria L., Blister sedge, Inflated sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Carex viridula Michx., Green sedge, Little green sedge, Native, Jackson Co., Photos Phytoimages, USDA_Plants

• Carex vulpinoidea Michx., Fox sedge, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Cyperus acuminatus Torr. & Hook. ex Torr., Tapertip flatsedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Cyperus bipartitus Torr., Slender flatsedge, Synonyms: Cyperus rivularis Kunth, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Cyperus erythrorhizos Muhl., Redroot flatsedge, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Cyperus fendlerianus Boeckeler, Fendler's flatsedge, Synonyms: Mariscus fendlerianus (Boeckeler) T. Koyama, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Cyperus lupulinus (Spreng.) Marcks, Great Plains flatsedge, Synonyms: Mariscus filiculmis auct. non (Vahl) T. Koyama, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Cyperus schweinitzii Torr., Schweinitz's flatsedge, Synonyms: Mariscus schweinitzii (Torr.) T. Koyama, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Cyperus squarrosus L., Bearded flatsedge, Synonyms: Cyperus aristatus Rottb., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eleocharis acicularis (L.) Roem. & Schult., Needle spikerush, Needle spikesedge, Native, Common, Photos Phytoimages, USDA_Plants

• Eleocharis compressa Sull., flatstem spikerush, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Eleocharis engelmannii Steud., Engelmann's spikerush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eleocharis obtusa (Willd.) Schult., Blunt spikerush, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Eleocharis palustris (L.) Roem. & Schult., Common spikerush, Creeping spikerush, Creeping spike-rush, Marsh spike-rush, Spikesedge, Native, Common, Photos Phytoimages, USDA_Plants

• Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer, dwarf spikerush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eleocharis pauciflora (Lightf.) Link, Fewflower spikerush, Few-flower spikerush, Few-flower spike-rush, Fewflowered spikesedge, Synonym: Eleocharis quinqueflora (Hartmann) O. Schwarz, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Eleocharis rostellata (Torr.) Torr., Beaked spikerush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriophorum angustifolium Honck., Tall cottongrass, Eriophorum angustifolium ssp. scabriusculum Honck., Native, Uncommon, Photos Phytoimages, USDA_Plants

• Eriophorum gracile W.D.J. Koch, Slender cotton-grass, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Kobresia myosuroides (Vill.) Fiori, Bellardi bog sedge, Bellardi kobresia, Native, Common, Photos Phytoimages, USDA_Plants

• Kobresia sibirica (Turcz.) Boeckeler, Siberian bog sedge, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Kobresia simpliciuscula (Wahlenb.) Mack., simple bog sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Lipocarpha aristulata (Coville) G. Tucker, Awned halfchaff sedge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve, hardstem bulrush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Schoenoplectus americanus (Pers.) Volkart ex Schinz & R. Keller, Olney's three-square bulrush, Chairmaker's bulrush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Schoenoplectus pungens (Vahl) Palla, Common three-square bulrush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Schoenoplectus tabernaemontani (C.C. Gmel.) Palla, Softstem bulrush, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Scirpus microcarpus J.Presl & C.Presl, Panicled bulrush, Red-tinge bulrush, Smallfruit bulrush, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Scirpus pallidus (Britton) Fernald, Cloaked bulrush, Pale bulrush, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants