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Broad Spiked Spikerush
Eleocharis obtusa
About Broad Spiked Spikerush (Eleocharis obtusa) Nurseries Show All Photos Eleocharis obtusa is a species of spikesedge known by the common name blunt spikerush. This plant is widely distributed across Canada and the United States, where it grows in wet areas such as riverbanks and moist forest floors. It is also a weed of rice paddies, especially when the rice plants are young sprouts. This is an annual spikesedge approaching half a meter in maximum height. It has many green cylindrical stems which are erect but weak and spongy. There may be thin, grasslike leaves toward the base of the plant, which are generally straw-colored. Atop each stem is a rounded or oblong spikelet containing at least ten flowers, each covered by an oval-shaped brown bract.
Plant Description
Plant Type

Max. Height
1.6 ft (0.49 m)


Growth Rate

Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Wet soil of pond and lake Edges, marshes, often

Sun, Part Shade

Elevation ?
13' - 4821'

Annual Precip. ?
10.8" - 110.5"

Summer Precip. ?
0.31" - 3.10"

Coldest Month ?
34.0° F - 49.4° F

Hottest Month ?
60.9° F - 80.4° F

Humidity ?
0.87 vpd - 27.75 vpd

Soil Description
Adaptable, tolerant of sand, loam and clay


Butterflies ?


Landscaping Information
Common uses
Bird Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Botanical Names
Eleocharis obtusa var. obtusa

Common Names
Blunt Spikerush

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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