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Thread Leaf Sedge Back to Plant Page
Carex filifolia

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About Thread Leaf Sedge (Carex filifolia) Carex filifolia is a species of sedge known by the common name threadleaf sedge. It is native to much of western North America, from Alaska to California and Manitoba to New Mexico, where it grows in moist and dry habitat. This sedge produces clumps of stems which are rounded or triangular, wiry, and angled or curved, reaching up to about 35 centimeters long. The root network is extensive and it forms sod. The leaves are narrow and rolled tightly, appearing quill-like. The flower cluster is up to 3 centimeters long and has flowers coated with reddish scales. The fruit is covered in a sac called a perigynium which is somewhat hairy. The plant produces some seeds, but mainly reproduces vegetatively.
Plant Description
Plant Type

Max. Height
1.2 ft (0.37 m)


Growth Rate

Flower Color
Green, Red

Flowering Season

Native Status

Natural Setting
Site Type
Meadows, and moist places

Part Shade

Elevation ?
3542' - 12863'

Annual Precip. ?
10.2" - 79.2"

Summer Precip. ?
0.43" - 2.78"

Coldest Month ?
17.2° F - 49.2° F

Hottest Month ?
39.1° F - 71.7° F

Humidity ?
0.37 vpd - 20.23 vpd

Soil Description
Prefers sandy or loamy soils. Does not grow well in clay soils.

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Threadleaf Sedge

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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