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Slender Flatsedge Back to Plant Page
Cyperus bipartitus

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About Slender Flatsedge (Cyperus bipartitus) Cyperus bipartitus, commonly known as slender flatsedge, river cyperus, or the shining flatsedge, is a common species of sedge. The name "slender flatsedge" also applies to Cyperus gracilis. C. bipartitus is native to the Americas, where it is found widely distributed from north to south in wet environments, such as lakes, sandbars, and ditches from elevations of 30 metres (98 ft) to 1,140 metres (3,740 ft). This is a small annual plant with fibrous roots and thin stems rarely exceeding about 25 centimetres (9. 8 in) in height. There may be a one to three thin, short leaves around the base of the plant. The inflorescence is one to two centimeters long and holds several flat spikelets. These may be surrounded by long, leaflike bracts. Each spikelet contains flowers covered by dark reddish brown bracts. The achene fruit is a black disc about a millimeter wide.
Plant Description
Plant Type

Max. Height
0.8 - 5 ft (0.24 - 1.5 m)


Growth Rate

Flower Color

Flowering Season

Native Status

Natural Setting
Elevation ?
35' - 3779'

Annual Precip. ?
14.2" - 78.4"

Summer Precip. ?
0.28" - 1.70"

Coldest Month ?
37.2° F - 49.7° F

Hottest Month ?
60.3° F - 75.4° F

Humidity ?
0.46 vpd - 24.20 vpd

Soil Description
Adaptable, tolerant of sand, loam and clay

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
The Shining Flatsedge, River Cyperus

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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