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Carex aperta Boott
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Following modified from Plants Database, United States Department of Agriculture
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Carex aperta Boott
Columbian sedge

General Information
Symbol: CAAP3
Group: Monocot
Family: Cyperaceae
Duration: Perennial
Growth Habit : Graminoid
Native Status : CAN   N
L48   N
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Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   




Symbol Scientific Name
CAAC9 Carex accedens T. Holm
CAACT Carex acutina L.H. Bailey var. tenuior
CASTV Carex stylosa C.A. Mey. var. virens L.H. Bailey
CATU9 Carex turgidula L.H. Bailey


Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Liliopsida – Monocotyledons
Subclass Commelinidae
Order Cyperales
Family Cyperaceae – Sedge family
Genus Carex L. – sedge
Species Carex aperta Boott – Columbian sedge

Subordinate Taxa

This plant has no children

Legal Status

Wetland Status

Interpreting Wetland Status

North America
Arid West FACW
Great Plains FACW
Western Mountains, Valleys, and Coast OBL

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Integrated Taxonomic Information System (CAAC9)
Integrated Taxonomic Information System (CAACT)
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Integrated Taxonomic Information System (CASTV)
Integrated Taxonomic Information System (CATU9)



Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover

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Following modified from Flora of North America
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Link to Flora of North America home
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FNA Vol. 23 Page 381, 393, 395 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 23 | Cyperaceae | Carex

191. Carex aperta Boott in W. J. Hooker, Fl. Bor.-Amer. 2: 218, plate 219. 1839.

Carex accedens T. Holm; C. acutina L. H. Bailey var. tenuior L. H. Bailey; C. aperta var. umbrosa Kükenthal; C. aperta var. viridans Kükenthal; C. stylosa C. A. Meyer var. virens L. H. Bailey; C. turgidula L. H. Bailey

Plants not cespitose. Culms acutely angled, 15—90 cm, scabrous. Leaves: basal sheaths red-brown; sheaths of proximal leaves with blades, backs glabrous, fronts with pale brown spots, veinless, glabrous, apex U-shaped, membranous, colorless; blades 3—6 mm wide. Inflorescences: proximal bract subequal to inflorescence, 2—4 mm wide. Spikes: erect; proximal 2—3 spikes pistillate, 1.5—3.5 cm × 4—6 mm, base obtuse; terminal 1—2 spikes staminate. Pistillate scales red-brown, longer than perigynia, apex acute or acuminate, awnless. Perigynia divergent, olive-brown with red-brown spots on apical 1/2, veinless, inflated, loosely enclosing achenes, obovoid, 2.5—2.8 × 1.5—2 mm, dull, apex rounded, papillose; beak green, 0.1—0.3 mm. Achenes not constricted, dull. 2n = 54.

Fruiting Jul—Aug. Wet meadows; 0—900 m; Alta., B.C.; Idaho, Mont., Oreg., Wash.

Carex aperta and C. haydenii appear to be a very closely related, allopatric pair of species that may not be closely related to other members of the section. This species-pair is distinguished by the inflated perigynia, the acute scales that are longer than the perigynia, and the unique chromosome number. Carex aperta is distinguished from C. haydenii by its rhizomatous habit, the dull brown achenes, and the entire beak. It is sometimes mistaken for the sympatric taxa that also lack veins on the perigynia, C. aquatilis and C. scopulorum; mature specimens can easily be identified by the inflated perigynia.

Updated: 2019-09-21 13:35:59 gmt
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