Torr.
Identity
Unique IDELEMENT_GLOBAL.2.154462
Element CodePMCYP063U0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
IUCNLeast concern
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassMonocotyledoneae
OrderCyperales
FamilyCyperaceae
GenusCyperus
SynonymsCyperus rivularisKunthPycreus bipartitus(Torr.) C.B. Clarke
Other Common Namesslender flatsedge (EN) Slender Flatsedge (EN) Souchet des rivières (FR)
Concept ReferenceKartesz, 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.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2025-07-24
Change Date1993-07-08
Edition Date2025-07-24
Edition AuthorsSkello, M. (1993), rev. Johnson, J. (2025)
Threat ImpactUnknown
Range Extent>2,500,000 square km (greater than 1,000,000 square miles)
Number of Occurrences> 300
Rank ReasonsCyperus bipartitus is an annual graminoid that is native to much of North, Central, and South America. With a large range extent, more than 1200 occurrences, abundant habitat, and broad habitat preferences, this species is considered secure.
Range Extent CommentsCyperus bipartitus is native to much of the United States and southern Canada, extending south through Central America to central South America as far south as northern Argentina (POWO 2025). In the United States, Cyperus bipartitus is common in the eastern and Pacific northwest states but sparse in the desert southwest and absent from the northern Great Plains and Rocky Mountains (FNA 2002). Range extent was estimated to be 34 million square kilometers using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1994 and 2025 (GBIF 2025, iNaturalist 2025, NatureServe 2025, RARECAT 2025, SEINet 2025).
Occurrences CommentsBy applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1994 and 2025, it is estimated that there are more than 1200 occurrences rangewide (GBIF 2025, iNaturalist 2025, NatureServe 2025, RARECAT 2025, SEINet 2025).
Threat Impact CommentsAlthough threats are not widely documented, Cyperus bipartitus is potentially threatened by development, road maintenance, invasive species, and other threats in some places. However, their overall impact is likely negligible given the species' broad range, large number of occurrences, tolerance of light disturbance, and affinity for typically abundant habitats.