Cyperus bipartitus

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Family:	CYPERACEAE
Species:	Cyperus bipartitus Torr.
Common Name:	SLENDER FLATSEDGE
Status:	Native, FACW (NWPL)
Specimen:	View details of USF Herbarium specimens

** Not applicable or data not available.

Classification

Division
Class
Sub Class
Order	POALES
Family	CYPERACEAE
Genus	Cyperus
Species	Cyperus bipartitus Torr. - SLENDER FLATSEDGE

Citation

Citation	CYPERUS BIPARTITUS Torrey, Ann. Lyceum Nat. Hist. New York 3: 257. 1836.
Basionym:	**
Type:	LOUISIANA: Orleans Par.: New Orleans, s.d., Ingalls s.n. (holotype: NY).

** Not applicable or data not available.

Source

County	Herbaria	Literature Citation (If Applicable)
Wakulla	FSU

Synonyms

– Denotes synonyms that are applicable to the state. Show these synonyms only

Synonym	Full Citation	Basionym	Type
Chlorocyperus rivularis	Chlorocyperus rivularis (Kunth) Rikli, Jahrb. Wiss. Bot. 27: 564. 1895.	BASIONYM: Cyperus rivularis Kunth 1837.
Cyperus diandrus var. bipartitus	Cyperus diandrus Torrey, var. bipartitus (Torrey) Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 384. 1936.	BASIONYM: Cyperus bipartitus Torrey 1836.
Cyperus niger var. rivularis	Cyperus niger Ruiz Lopez & Pavon, var. rivularis (Kunth) V. E. Grant, Aliso 4(1): 87. 1958.	BASIONYM: Cyperus rivularis Kunth 1837.
Cyperus rivularis	Cyperus rivularis Kunth, Enum. Pl. 2: 6. 1837.		TYPE: GEORGIA:
Pycreus bipartitus	Pycreus bipartitus (Torrey) C. B. Clarke, Bull. Misc. Inform., Addit. Ser. 8: 2. 1908.	BASIONYM: Cyperus bipartitus Torrey 1836.
Pycreus rivularis	Pycreus rivularis (Kunth) Palla, Allg. Bot. Z. Syst. 13: 48. 1907.	BASIONYM: Cyperus rivularis Kunth 1837.
Cyperus argentinus	Cyperus argentinus C. B. Clarke, J. Linn. Soc., Bot. 21: 64. 1884 ("1886"), non Boeckeler 1884.		TYPE: ARGENTINA: Without data, Lorentz 1075 (holotype: K).
Cyperus bicolor	Cyperus bicolor Barton, Comp. Fl. Philadelph. 1: 27. 1818, non Vahl 1805.		TYPE: PENNSYLVANIA:
Cyperus bigelowii	Cyperus bigelowii Steudel, Syn. Pl. Glumac. 2: 5. 1855.	BASIONYM: Cyperus castaneus (Pursh) Bigelow 1824, non Willdenow 1797; Cyperus flavescens Linnaeus, var. castaneus Pursh 1814.
Cyperus bipartitus forma elongatus	Cyperus bipartitus Torrey, forma elongatus (Boeckeler) Mohlenbrock, Ill. Fl. Illinois, Sedges: Cyperus to Scleria, ed. 2. 184. 2001.	BASIONYM: Cyperus rivularis Linnaeus, var. elongatus Boeckeler 1868.
Cyperus bipartitus forma elutus	Cyperus bipartitus Torrey, forma elutus (C. B. Clarke) Mohlenbrock, Ill. Fl. Illinois, Sedges: Cyperus to Scleria, ed. 2. 184. 2001.	BASIONYM: Cyperus rivularis Kunth, var. elutus C. B. Clarke 1884.
Cyperus castaneus	Cyperus castaneus (Pursh) Bigelow, Fl. Boston, ed. 2. 18. 1824, non Willdenow 1797.	BASIONYM: Cyperus flavescens Linnaeus, var. castaneus Pursh 1814.
Cyperus diandrus var. castaneus	Cyperus diandrus Torrey, var. castaneus (Pursh) Torrey, Ann. Lyceum nat. Hist. New York 3: 252. 1836.	BASIONYM: Cyperus flavescens Linnaeus, var. castaneus Pursh 1814.
Cyperus flavescens var. bicolor	Cyperus flavescens Linnaeus, var. bicolor Farwell, Amer. Midl. Naturalist 12: 118. 1930.	BASIONYM: Cyperus bicolor Barton 1818, non Vahl 1805.
Cyperus flavescens var. castaneus	Cyperus flavescens Linnaeus, var. castaneus Pursh, Fl. Amer. Sept. 52. 1814.
Cyperus lagunetto	Cyperus lagunetto Stuedel, Syn. Pl. Glumac. 2: 5. 1854.		TYPE: VENEZUELA: Mérida: Bailadores, Jun 1843, Linden 1896 (holotype: ?; isotype: BR).
Cyperus pauper	Cyperus pauper Philippi, Anales Univ. Chile 1873: 553. 1873, non A. Richard 1850.		TYPE: CHILE
Cyperus rivularis forma acutatus	Cyperus rivularis Kunth, forma. acutatus (C. B. Clarke) Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 383. 1936.	BASIONYM: Cyperus rivularis Kunth, var. acutatus C. B. Clarke 1884.
Cyperus rivularis forma depauperatus	Cyperus rivularis Kunth, forma depauperatus (C. B. Clarke) Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 383. 1936.	BASIONYM: Cyperus rivularis Kunth, var. depauperatus C. B. Clarke 1884.
Cyperus rivularis forma elongatus	Cyperus rivularis Kunth, forma elongatus (Boeckeler) Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 383. 1936.	BASIONYM: Cyperus rivularis Linnaeus, var. elongatus Boeckeler 1868.
Cyperus rivularis forma elutus	Cyperus rivularis Kunth, forma elutus (C. B. Clarke) Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 383. 1936.	BASIONYM: Cyperus rivularis Kunth, var. elutus C. B. Clarke 1884.
Cyperus rivularis forma subacaulis	Cyperus rivularis Kunth, forma subacaulis Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 384. 1936.		TYPE: ARGENTINA:
Cyperus rivularis subsp. lagunetto	Cyperus rivularis Kunth, subsp. lagunetto (Steudel) Kükenthal, in Engler, Pflanzenr. 4(Heft 101): 383. 1936.	BASIONYM: Cyperus lagunetto Steudel 1854.
Cyperus rivularis var. acutatus	Cyperus rivularis Kunth, var. acutatus C. B. Clarke, J. Linn. Soc., Bot. 21: 66. 1884.		TYPE: MEXICO:
Cyperus rivularis var. depauperatus	Cyperus rivularis Kunth, var. depauperatus C. B. Clarke, J. Linn. Soc., Bot. 21: 65. 1884.		TYPE: MICHIGAN:
Cyperus rivularis var. elongatus	Cyperus rivularis Kunth, var. elongatus Boeckeler, Linnaea 35: 453. 1868.
Cyperus rivularis var. elutus	Cyperus rivularis Kunth, var. elutus C. B. Clarke, J. Linn. Soc., Bot. 21: 65. 1884.		TYPE: PENNSYLVANIA:
Cyperus rivularis var. lagunetto	Cyperus rivularis Kunth, var. lagunetto (Steudel) O'Neill, Rhodora 44: 86. 1942.	BASIONYM: Cyperus lagunetto Steudel 1854.
Pycreus lagunetto	Pycreus lagunetto (Steudel) C. B. Clarke, Bot. Jahrb. Syst. 30(Beibl. 68): 8. 1901.	BASIONYM: Cyperus lagunetto Steudel 1854.

Specimens

Country	State	County	Date	Specimen	Notes
USA	North Carolina	Washington Co.	17 Aug 1958	A. E. Radford 42383
USA	New Hampshire	Madison Co.	Sep 1911	W. G. Farlow s.n.
USA	Missouri	Jasper Co.	28 Aug 1927	E. J. Palmer 32645
USA	Illinois	McDonough Co.	06 Aug 1997	S. R. Hill 29647
USA	Maine	Franklin Co.	29 Aug 1892	C. H. Knowlton s.n.
USA	Illinois	Champaign Co.	11 Aug 1884	A. B. Seymour 170
USA	Ohio	Shelby Co.	31 Jul 2010	A. R. Franck 2267
USA	Illinois	Kane Co.	25 Aug 2005	S. R. Hill 36619
USA	Wisconsin	Marquette Co.	21 Sep 1963	H. H. Iltis 21096
USA	Wisconsin	Green Lake Co.	16 Sep 1978	T. Underwood 1206
USA	Virginia	Princess Anne Co.	08 Oct 1961	R. Kral 14407
USA	Virginia	Rappahannock Co.	27 Sep 1981	T. R. Bradley 17704
USA	Wisconsin	Sawyer Co.	13 Aug 1986	B. F. Hansen 11233
USA	Pennsylvania	Erie Co.	18 Aug 1941	N. P. Ammons s.n.
USA	Minnesota	Washington Co.	29 Aug 1976	G. B. Ownbey 5459
Canada	Quebec Prov.	Lotbinière Mun.	24 Aug 1942	F. Marie-Victorin 7364
USA	Illinois	McDonough Co.	15 Sep 1974	R. M. Myers 4881
USA	Illinois	McHenry Co.	19 Sep 2000	S. R. Hill 33198
USA	Illinois	Champaign Co.	22 Sep 1999	S. R. Hill 32068	CULTIVATED.

Listed Status: Florida

Listed Status:	(Florida):Source - Plants in the Preservation of Native Flora of Florida Act. Chapter 5B-40, Florida Administrative Code. 1998, amended.
Endangered:	A species of plants native to the state that are in imminent danger of extinction within the state, the survival of which is unlikely if the causes of a decline in the number of plants continue, and includes all species determined to be endangered or threatened pursuant to the Federal Endangered Species Act of 1973, as amended.
Threatened:	Listed as Threatened Plants in the Preservation of Native Flora of Florida Act. Defined as species of plants native to the state that are in rapid decline in the number of plants within the state, but which have not so decreased in such number as to cause them to be endangered.

Listed Status: US

Listed Status: US	(U.S.) Source - List of Endangered and Threatened Wildlife and Plants under the provisions of the Endangered Species Act of 1973, as amended.
Endangered:	Any species which is in danger of extinction throughout all or a significant portion of its range.
Threatened:	Any species which is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range.

WAP: Wetland AssessmentProcedure

Wetland Assessment Procedure (WAP): Source - Southwest Florida Water Management District, Wetland Assessment Procedure Instruction Manual for Isolated Wetlands (March 2005).

AD:	Adaptive Species. Plant species designated as FAC or Upland by DEP, but commonly seen in the transition zone in limited numbers.
D:	Deep Species. Plant species commonly found in the deep zone, and designated either FAC or OBL by DEP.
OD:	Outer Deep Species. Plant species commonly found in the outer deep zone, and designated either FACW or OBL by DEP.
T:	Transition Species. Plant species commonly found in the transition zone, and designated either FACW or OBL by DEP.
U:	Upland Species. Plant species that are not expected to be seen in wetlands.

ANY - WAP critieria is not taken into consideration
Yes - Show results with WAP designations
No - Show results without WAP designations

FISC: Florida Invasive Species Council

FISC:

Source - Florida Invasive Species Council's 2017 List of Florida's Most Invasive Species

Category I - Species that are invading and disrupting native plant communities in Florida. This definition does not rely on the economic severity or geographic range of the problem, but on the documented ecological damage caused.

Category II - Species that have shown a potential to disrupt native plant communities. These species may become ranked as Category I, but have not yet demonstrated disruption of natural Florida communities.

DEP: Department of Environmental Protection

Wetland Status, Department of Environmental Regulation (DEP): Source - Delineation of the Landward Extent of Wetlands and Surface Waters, Chapter 62-340, Florida Administrative Code. 1994.

OBL:	Obligate wetland. Occurs almost always under natural conditions in wetlands.
FACW:	Facultative Wetland. Usually occurs in wetlands, but occasionally found in non-wetlands
FAC:	Facultative. equally likely to occur in wetlands or non-wetlands.

NWPL: National Wetland Plant List

National Wetland Plant List (NWPL): Source - Lichvar, R.W., M. Butterwick, N.C. Melvin, and W.N. Kirchner. 2014. The National Wetland Plant List: 2014 Update of Wetland Ratings. Phytoneuron 2014-41: 1-42.

OBL:	Obligate Wetland. Occurs almost always (estimated probability 99%) under natural conditions in wetlands.
FACW:	Facultative Wetland. Usually occurs in wetlands (estimated probability 67%-99%), but occasionally found in non-wetlands.
FAC:	Facultative. Equally likely to occur in wetlands or non-wetlands (estimated probability 34%-66%).
FACU:	Facultative Upland. Usually occurs in non-wetlands (estimated probability 67%-99%), but occasionally found in wetlands (estimated probability 1%-33%).
UPL:	Obligate Upland. Occurs in wetlands in another region, but occurs almost always (estimated probability 99%) under natural conditions in non-wetlands in the regions specified.

Persisting

Identifying species that appear as waifs or only periodically appear in the flora for a few seasons.

Any - Persisting critieria is not taken into consideration
Yes - Show results with a Persisting value of Y
No - Show results without Persisting value of N

Duration

Annual:	Plants that perform their entire lifecycle within a single growing season. All roots, stems, and leaves die at the end of the growing season. Over wintering seeds allow the next generation to appear.
Biennial:	A plant that is typically vegetative its first year and blooms the following season. Once it has bloomed and set seed, the plant dies. Garlic mustard is an example of a biennial.
Perennial:	These plants live for three or more seasons. Many perennials may not be mature enough to bloom during its first year. Perennial wildflowers re-grow each season from overwinter root material.

Category

Vascular:	Any of various plants that have the vascular tissues xylem and phloem. The vascular plants include all seed-bearing plants (the gymnosperms and angiosperms) and the pteridophytes (including the ferns, lycophytes, and horsetails). Also called tracheophyte.
Bryophyte:	A large group of seedless green plants including the mosses, liverworts, and hornworts. Bryophytes lack the specialized tissues xylem and phloem that circulate water and dissolved nutrients in the vascular plants. Bryophytes generally live on land but are mostly found in moist environments, for they have free-swimming sperm that require water for transport. In contrast to the vascular plants, the gametophyte (haploid) generation of bryophytes constitutes the larger plant form, while the small sporophyte (diploid) generation grows on or within the gametophyte and depends upon it for nutrition.
Lichen:	The mutualistic symbiotic association of a fungus with an alga or a cyanobacterium, or both. The fungal component of a lichen absorbs water and nutrients from the surroundings and provides a suitable environment for the alga or cyanobacterium. These live protected among the dense fungal hyphae and produce carbohydrates for the fungus by photosynthesis. Owing to this partnership, lichens can thrive in harsh environments such as mountaintops and polar regions. The more familiar lichens grow slowly as crusty patches, but lichens are found in a variety of forms, such as the tall, plantlike reindeer moss. The association between the different organisms in a lichen is so close that lichens are routinely referred to as a single organism, and scientists classify lichens using the name of the fungal component.

(Definitions from: American Heritage Science Dictionary)

Growth Habit

Intro paragraph to be provided by New York.

Vine:	DESCRIPTION TO BE PROVIDED BY NEW YORK.
Shrub:	DESCRIPTION TO BE PROVIDED BY NEW YORK.
Tree:	DESCRIPTION TO BE PROVIDED BY NEW YORK.
Et cetera:	DESCRIPTION TO BE PROVIDED BY NEW YORK.

State Rank

This numeric rank provides the relative rarity for each species based on a scale from 1 (very rare) to 5 (common). These ranks carry no legal status.

S1 - Typically 5 or fewer occurrences, very few remaining individuals, acres, or miles of stream, or some factor of its biology making it especially vulnerable in the state.
S2 - Typically 6 to 20 occurrences, few remaining individuals, acres, or miles of stream, or factors demonstrably making it very vulnerable in the state.
S3 - Typically 21 to 100 occurrences, limited acreage, or miles of stream in the state.
S4 - Apparently secure in the state.
S5 - Demonstrably secure in the state.
SE - State exotic or non-native.
SH - Historically known from the state, but not seen in the past 15 years.
SNA - Species for which a rank is not applicable. This is mainly those species which are now excluded from flora for various reasons.
SNR - Not yet ranked.
SX - Apparently extirpated from the state.

Global Rank

Each species' global rank is determined by NatureServe. These ranks carry no legal weight. The global rank reflects the species worldwide rarity.

G1 - Critically imperiled globally because of extreme rarity (5 or fewer occurrences), or very few remaining acres, or miles of stream) or especially vulnerable to extinction because of some factor of its biology.
G2 - Imperiled globally because of rarity (6 - 20 occurrences, or few remaining acres, or miles of stream) or very vulnerable to extinction throughout its range because of other factors.
G3 - Imperiled globally because of rarity (6 - 20 occurrences, or few remaining acres, or miles of stream) or very vulnerable to extinction throughout its range because of other factors.
G4 - Imperiled globally because of rarity (6 - 20 occurrences, or few remaining acres, or miles of stream) or very vulnerable to extinction throughout its range because of other factors.
G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
GH - Historically known, with the expectation that it might be rediscovered.
GNA - Species for which a rank is not applicable. NatureServe does not typically rank hybrid species.
GNR - Not yet ranked.
GX - Species believed to be extinct.

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Filter by County - Counties to Exclude - ANY versus ALL

Any - An Any search will combine the list of counties to exclude with a Boolean Or. Plant species returned will not be found within at least one of the selected counties.
All - An All search will combine the list of counties to exclude with a Boolean And. Plant species returned will not be found within any of the selected counties.

Associated Ecological Communities

View a List of All Ecological Communities

For more information, contact: Richard Wunderlin or Bruce Hansen, Alan Franck, or Karla Alvarado

Web Development: USF Water Institute

A member of the University of South Florida family of PlantAtlas.org websites

Citation Information:

Wunderlin, R. P., B. F. Hansen, A. R. Franck, and F. B. Essig. 2025. Atlas of Florida Plants (http://florida.plantatlas.usf.edu/). [S. M. Landry and K. N. Campbell (application development), USF Water Institute.] Institute for Systematic Botany, University of South Florida, Tampa.

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Definition: Vouchered Specimen

A voucher specimen is a pressed and thoroughly dried plant sample deposited in a herbarium, and is intended to be a permanent record supporting research purposes. A voucher may be a record of a plant's occurrence in a particular area, or a specific example of a plant used in a scientific investigation.

Proper vouchers display all the necessary attributes for complete identification of the plant, and are to be accompanied by accurate locality, habitat, collection time, and collector data.

Only plant populations vouchered by specimens deposited in Index Herbariorum http://sweetgum.nybg.org/science/ih/ recognized herbaria are represented on this map.