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Dudley's Sedge
Carex nudata

About Dudley's Sedge (Carex nudata) Carex nudata is a species in the Cyperaceae (Sedge) family known by several common names, including Torrent Sedge, California Black-flowering Sedge, Dudley's Sedge, and Naked Sedge. This is a bright green sedge which grows in mounds below the high-water mark in marshes and on river banks. It bears long scaly spikes of black, dark reddish or dusky brown flowers, which begin erect and then droop when they become heavy. It grows amidst rocks and becomes a dense mounding tussock. It is found mainly in California and Oregon.
Plant Description
Plant Type

Max. Height
1 - 2.5 ft (0.3 - 0.8 m)

Max. Width
2 ft (0.6 m)


Winter Deciduous

Flower Color
Brown, Cream, Red, Black

Native Status

Natural Setting
Site Type
Rocky or sandy streambeds

Part Shade, Shade

Elevation ?
3' - 7026'

Annual Precip. ?
9.2" - 110.4"

Summer Precip. ?
0.17" - 3.20"

Coldest Month ?
31.8° F - 53.1° F

Hottest Month ?
52.2° F - 75.7° F

Humidity ?
0.04 vpd - 25.55 vpd

Soil Description
Tolerates rocky, gravelly, sandy or clay soils as long as plenty of water is available

Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to 5° F

Sunset Zones ?
1, 2, 3, 4*, 5*, 6*, 7*, 8, 9, 14*, 15*, 16*, 17*, 18, 19, 20, 21, 22, 23, 24

Companion Plants
Use with other marsh plants such as Carex sp., Spikerush (Eleocharis sp.), Rush (Juncus sp.), SaltMarsh Fleabane (Pluchea odorata), Arrowhead (Sagittaria sp.), Willow (Salix sp.), Hedge Nettle (Stachys bullata), and Cattail (Typha sp.)

Landscaping Information
Water Requirement ?
Moderate - High
Extremely Low
Very Low
Moderate - High

Max. Summer Water ?
Keep moist
No Summer Water
Keep moist

Common uses
Bogs and Ponds, Deer Resistant

Other Names
Common Names
California Black-flowering Sedge, Naked Sedge, Santa Barbara Sedge, Torrent 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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