Rhynchospora knieskernii - Carey
Knieskern's Beaksedge
Other English Common Names: Knieskern's Beaked-rush, Knieskern's Beakrush
Other Common Names: Knieskern's beaksedge
Taxonomic Status: Accepted
Related ITIS Name(s): Rhynchospora knieskernii Carey (TSN 40183)
Unique Identifier: ELEMENT_GLOBAL.2.134727
Element Code: PMCYP0N190
Informal Taxonomy: Plants, Vascular - Flowering Plants - Sedge Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Cyperales Cyperaceae Rhynchospora
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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: Rhynchospora knieskernii
Taxonomic Comments: Distinct member in genus of around 200 species.
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 28Jul2004
Global Status Last Changed: 28Jul2004
Rounded Global Status: G2 - Imperiled
Reasons: This species is now endemic to 5 counties within the New Jersey Pine Barrens, where fewer than 40 recent occurrences have been documented. Most of these are in artificially disturbed habitats located on unprotected lands. Many of these populations are declining due to woody succession of the habitat or through impacts associated with over-use by recreational vehicles, fire supression, roadside scraping, and other incompatible land uses. Very few occurrences occur on adequately protected lands or in habitats where natural disturbance regimes remain intact. The species was collected from 2 locations in Delaware, but it has not been documented in that state since 1875 and is presumed extirpated.
Nation: United States
National Status: N2

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 Delaware (SX), New Jersey (S2)

Other Statuses

U.S. Endangered Species Act (USESA): LT: Listed threatened (18Jul1991)
U.S. Fish & Wildlife Service Lead Region: R5 - Northeast

NatureServe Global Conservation Status Factors

Range Extent Comments: New Jersey (Pine Barrens); historic in Sussex Co., Delaware. Controversy exists as to whether the Delaware specimens may have been mislabled as being collected from Delaware in error. Until resolved, the presumption is that they were collected from Delaware. Specimens reportedly collected from MD have been recently reported. MDNHP skeptical, and currently do not accept the report. Specimen (1800's) at PH labled "FL" collected by Chapman. DBS rejects this based on probability that it was a NJ specimen received through exchange (possibly from John Carey) and simply reflects Chapman's address.

Area of Occupancy: 26-125 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 6 - 20
Number of Occurrences Comments: 21 extant occurrences (1985) in NJ Pine Barrens. All but 6 are in artificial habitats; 2 historic in DE.

Population Size Comments: Species tends to occur in dense, local patches; total abundance estimated at 5,500 sq. yd.

Overall Threat Impact Comments: Vulnerable to roadside grading, sand & gravel operations, habitat succession, development, & recreational pressures.

Intrinsic Vulnerability Comments: EOs in artificially maintained habitats fairly resistant. Natural EOs are all small and are easily impacted.

Other NatureServe Conservation Status Information

Distribution
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Global Range: New Jersey (Pine Barrens); historic in Sussex Co., Delaware. Controversy exists as to whether the Delaware specimens may have been mislabled as being collected from Delaware in error. Until resolved, the presumption is that they were collected from Delaware. Specimens reportedly collected from MD have been recently reported. MDNHP skeptical, and currently do not accept the report. Specimen (1800's) at PH labled "FL" collected by Chapman. DBS rejects this based on probability that it was a NJ specimen received through exchange (possibly from John Carey) and simply reflects Chapman's address.

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 DEextirpated, NJ

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
NJ Atlantic (34001), Burlington (34005), Camden (34007), Monmouth (34025), Ocean (34029)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
02 Sandy Hook-Staten Island (02030104)+, Lower Delaware (02040202)+, Mullica-Toms (02040301)+, Great Egg Harbor (02040302)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A perennial sedge (or annual under adverse growing conditions) commonly under 40 cm, but occassionally reaching 60 cm or more. Spikelets of inconspicuous flowers are produced in small clusters along the length of the stem. Achenes mature from late July until frost.
Technical Description: "Cespitose perennial to 5 dm; stems slender, flexuous, leaves 1-2 mm wide, soon becoming involute; terminal glomerule turbinate, 5-10 mm thick; lateral glomerules 2 or 3, remote, somewhat smaller, subsessile; spikelets 2-3 mm, brown, with 2-3 fruits and a terminal staminate flower; bristles 6, retrorsely barbellate, half to fully as long as the achene; achenes plump, elliptic or obovate, 1.1-1.3 mm, slightly or scarcely more than half as wide, obscurely roughened, shining yellow-brown centrally, darker toward the margins; tubercle triangular, up to half as long as the achene." (Gleason and Cronquist, 1991)
Diagnostic Characteristics: Rhynchospora knieskernii may be characterized by bristles equalling or shorter than the achene; tubercle up to half as long as the achene (Gleason and Cronquist, 1991).
Duration: PERENNIAL
Palustrine Habitat(s): Bog/fen, FORESTED WETLAND
Habitat Comments: Restricted to early successional habitats in pitch pine lowland forests within pine barrens. Substrates are highly acidic, nutrient poor, fine grained mineral soils, frequently over clay deposits, but sometimes found on bog iron deposits. Sites typically have fluctuating water regimes. The species is a poor competitor and is usually found on bare or sparsely vegetated sites that are maintained open through natural disturbances such as fire or flood scouring, or through human-caused disturbances such as roadside, railroad, or powerline right-of-way maintenance, or in inactive sand or clay pits.
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: 30Oct1992
NatureServe Conservation Status Factors Author: Snyder, D., rev. D. Snyder (1997)
Element Ecology & Life History Edition Date: 23Jun1992

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
Help
  • Gleason, H.A. 1952. The new Britton and Brown illustrated flora of the northeastern United States and adjacent Canada. 3 volumes. Hafner Press, New York. 1732 pp.

  • Gleason, H.A., and A. Cronquist. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. New York Botanical Garden, Bronx, New York. 910 pp.

  • Hough, M.Y. 1983. New Jersey wild plants. Harmony Press, Harmony, NJ. 414 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.

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