Cyperus grayoides - Mohlenbrock
Mohlenbrock's Umbrella-sedge
Other English Common Names: Illinois Flatsedge, Midwestern Gray's Flatsedge
Other Common Names: Illinois flatsedge
Taxonomic Status: Accepted
Related ITIS Name(s): Cyperus grayoides Mohlenbrock (TSN 501927)
Unique Identifier: ELEMENT_GLOBAL.2.142876
Element Code: PMCYP061G0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Sedge Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Cyperales Cyperaceae Cyperus
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Cyperus grayoides
Taxonomic Comments: The name 'grayoides' (as spelled in USFWS, 1993, and Kartesz, 1999) is intended to note the resemblance of plants of this sedge species to plants of the species Cyperus grayi -- not their resemblance to the botanist Asa Gray. The name was originally published by Mohlenbrock as 'grayioides', the spelling used by Kartesz in his 1994 checklist. LEM 10Feb01, rev. 22Oct01.
Conservation Status
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NatureServe Status

Global Status: G3G4
Global Status Last Reviewed: 29Sep2015
Global Status Last Changed: 29Sep2015
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G3 - Vulnerable
Reasons: Cyperus grayioides is fairly abundant where it occurs, in open areas of deep, disturbed sands. It is restricted to areas with periodic disturbance by fire, wind, and/or erosion, however, and is vulnerable to encroachment by woody or weedy plant species. Sand prairie habitats have declined severely as a result of agricultural and residential development, fire suppression, and grazing. Many populations of C. grayioides occur on public lands, in which fires and natural soil disturbances are more likely to occur; in Missouri, however, all populations of this species currently occur on private lands.
Nation: United States
National Status: N3N4

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Arkansas (S1), Illinois (S2), Louisiana (S3), Missouri (S3), Texas (S3S4)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Cyperus grayioides occurs in areas of sandy soil in Illinois, Missouri, Arkansas, Louisiana, and Texas.

Number of Occurrences: 21 - 80
Number of Occurrences Comments: Known from thirteen sites in Illinois; sixteen in Missouri; seven in Arkansas; twenty-four in central and western Louisiana; and forty-two in Texas, for a total of 102 known, extant occurrences. Many of these populations have been discovered within the last five years.

Population Size Comments: A single occurrence in Illinois (Excel Sand Prairie Natural Heritage Landmark) numbers 12,000 plants. More typically, populations range in size between a few plants and a few hundred plants. Cyperus grayioides persists in the seed bank during years when the soils are not sufficiently disturbed to allow germination and successful growth; therefore, an aboveground estimate of numbers of plants may not accurately represent a population (Schwegman pers. comm. 1996).

Overall Threat Impact Comments: Cyperus grayioides is threatened primarily by loss of its natural disturbance regimes of fire and wind, which maintain open habitats and disturb the soil. Without these disturbance factors, woody and weedy plant species can encroach on populations of C. grayioides. Other potential threats to this species on private and public land include agricultural and residential development, livestock grazing, stabilization of blowouts through vegetation planting, extreme disturbance by timber harvesting, and sand mining (McKenzie 1994; Logan 1995).

Short-term Trend: Decline of <30% to relatively stable
Short-term Trend Comments: May be relatively stable on public lands where natural disturbance (e.g. wind, erosion, fire) maintains open habitats and stirs soils. Cyperus grayioides has likely declined severely in the past, however, primarily as a result of agricultural development and fire suppression. Populations of this species are not yet stable in Missouri, where occurrences are entirely on private lands (McKenzie 1994).

Intrinsic Vulnerability Comments: Vulnerable to the loss of open environment because of lack of periodic disturbance to habitat by fire, wind and/or erosion.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Cyperus grayioides occurs in areas of sandy soil in Illinois, Missouri, Arkansas, Louisiana, and Texas.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AR, IL, LA, MO, TX

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AR Nevada (05099), Ouachita (05103)
IL Carroll (17015), Cass (17017)*, Jo Daviess (17085)*, Mason (17125), Menard (17129), Whiteside (17195)
LA Beauregard (22011), Bienville (22013), Natchitoches (22069), Sabine (22085), Vernon (22115), Winn (22127)
MO Mississippi (29133), New Madrid (29143), Scott (29201), Stoddard (29207)
TX Anderson (48001), Angelina (48005), Austin (48015), Burleson (48051), Cherokee (48073), Colorado (48089), Franklin (48159), Freestone (48161), Hardin (48199), Henderson (48213), Houston (48225), Leon (48289), Nacogdoches (48347), Newton (48351), Parker (48367), Robertson (48395), Rusk (48401), San Augustine (48405), Shelby (48419), Smith (48423), Tyler (48457), Upshur (48459), Van Zandt (48467), Waller (48473), Wood (48499)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
07 Apple-Plum (07060005)+, Copperas-Duck (07080101)+, Lower Illinois-Lake Chautauqua (07130003)+, Lower Sangamon (07130008)+, Lower Illinois (07130011)+*
08 New Madrid-St. Johns (08020201)+, Little River Ditches (08020204)+, Upper Ouachita (08040102)+, Little Missouri (08040103)+, Dugdemona (08040303)+, Upper Calcasieu (08080203)+, Whisky Chitto (08080204)+
11 Lower Red-Lake Iatt (11140207)+, Saline Bayou (11140208)+, Black Lake Bayou (11140209)+, Lake O'the Pines (11140305)+, Little Cypress (11140307)+
12 Middle Sabine (12010002)+, Lake Fork (12010003)+, Toledo Bend Reservoir (12010004)+, Lower Sabine (12010005)+, Upper Neches (12020001)+, Lower Neches (12020003)+, Lower Angelina (12020005)+, Village (12020006)+, Cedar (12030107)+, Lower Trinity-Tehuacana (12030201)+, Lower Trinity-Kickapoo (12030202)+, Middle Brazos-Palo Pinto (12060201)+, Yegua (12070102)+, Navasota (12070103)+, Lower Brazos (12070104)+, San Bernard (12090401)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Mohlenbrock's umbrella-sedge; Cyperaceae (sedge family). A slender, perennial graminoid with rigid, folded leaves and loosely-flowered, hemispherically-shaped spikes with spikelets radiating in all directions.
Terrestrial Habitat(s): Barrens, Grassland/herbaceous, Woodland - Conifer, Woodland - Mixed
Habitat Comments: Cyperus grayioides occurs primarily in deep, periodically disturbed sandy soils in open areas maintained by factors such as wind, erosion, or fire. This species does not occur in shaded areas or in areas of high competition with other herbaceous species. Habitats include remnant sand prairies, sandy fields, sand "blow outs", sandhill woodlands, pine barrens, and open barrens in which the slope is sufficient to produce sand erosion. C. grayioides may also occur in areas where the soils have been disturbed by logging or road construction.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 01Apr1996
NatureServe Conservation Status Factors Author: K. Crowley, MRO (1996), rev. D. Gries (1997)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Hatch, S.L., K.N. Gandhi, and L.E. Brown. 1990. Checklist of the vascular plants of Texas. Texas Agricultural Experiment Station, College Station. 158 pp.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Logan, John M. 1995. An Arkansas survey for Cyperus grayioides Mohlenbrock. Arkansas Natural Heritage Commission, Suite 1500, Tower Building, 323 Center Street, Little Rock, AR 72201.

  • McKenzie, Paul M. 1994. Status review of umbrella sedge, Cyperus grayioides in Missouri. U.S. Fish and Wildlife Service, 608 E. Cherry St., Rm. 200, Columbia, MO 65201.

  • Schwegman, J.E. 1990. Preliminary results of a program to monitor plant species for management purposes. Pp. 113-116, in Ecosystme Management: Rare species and significant habitats. New York State Mus. Bull. 471.

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