Cyperus thyrsiflorusJungh.

southern flatsedge

WFO wfo-0000383985 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 3 observations

This species has been photographed under an open licence only 3 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Cyperus thyrsiflorus, photographed by Annika Lindqvist
fig. a Annika Lindqvist, CC BY 4.0 / 2020-07-08 / obs. 84289825
Cyperus thyrsiflorus, photographed by Jesse Rorabaugh
fig. b Jesse Rorabaugh, CC0 1.0 / obs. 5162163
Cyperus thyrsiflorus, photographed by Jesse Rorabaugh
fig. c Jesse Rorabaugh, CC0 1.0 / obs. 5162167
Cyperus thyrsiflorus, photographed by Annika Lindqvist
fig. d Annika Lindqvist, CC BY 4.0 / obs. 84289829
Cyperus thyrsiflorus, photographed by Annika Lindqvist
fig. e Annika Lindqvist, CC BY 4.0 / obs. 84290382
Cyperus thyrsiflorus, photographed by Jesse Rorabaugh
fig. f Jesse Rorabaugh, CC0 1.0 / obs. 5162170
Cyperus thyrsiflorus, photographed by Sam Kieschnick
fig. g Sam Kieschnick, CC BY 4.0 / obs. 88959970
Cyperus thyrsiflorus, photographed by Sam Kieschnick
fig. h Sam Kieschnick, CC BY 4.0 / obs. 88959903

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 23 botanical countries

Regions where Cyperus thyrsiflorus is native: Alabama, Florida, Georgia, Louisiana, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Texas, Bolivia, Colombia, Costa Rica, Cuba, Ecuador, El Salvador, Guatemala, Honduras, Nicaragua, Panamá, Paraguay, Peru, Trinidad-Tobago, Venezuela AlabamaFloridaGeorgiaLouisianaMexico GulfMexico NortheastMexico SoutheastMexico SouthwestTexasBoliviaColombiaCosta RicaCubaEcuadorEl SalvadorGuatemalaHondurasNicaraguaPanamáParaguayPeruTrinidad-TobagoVenezuela
Native distribution of Cyperus thyrsiflorus, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Bolivia BOL SOUTHERN AMERICA
Colombia CLM
Costa Rica COS
Cuba CUB
Ecuador ECU
El Salvador ELS
Guatemala GUA
Honduras HON
Nicaragua NIC
Panamá PAN
Paraguay PAR
Peru PER
Trinidad-Tobago TRT
Venezuela VEN
Alabama ALA NORTHERN AMERICA
Florida FLA
Georgia GEO
Louisiana LOU
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Southeast MXT
Mexico Southwest MXS
Texas TEX

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Also published as 20 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Cyperus amphekes Steud.
  • Cyperus anceps Liebm.
  • Cyperus dissitiflorus Nees ex Torr.
  • Cyperus pallens (Liebm.) Standl. & Steyerm.
  • Cyperus pittieri Boeckeler
  • Cyperus pittieri Boeckeler ex Kneuck.
  • Cyperus pseudosphacelatus Boeckeler
  • Cyperus regiomontanus var. pallens (Liebm.) Kük.
  • Cyperus regiomontanus var. pittieri (Boeckeler) Kük.
  • Cyperus thyrsiflorus var. anceps (Liebm.) Kük.
  • Cyperus thyrsiflorus var. macrior F.Aresch.
  • Cyperus thyrsiflorus var. vegetior F.Aresch.
  • Cyperus tonduzianus var. tenuis Boeckeler
  • Cyperus tribrachiatus (Liebm.) Kük.
  • Cyperus tribrachiatus var. tenuis (Boeckeler) Kük.
  • Mariscus dissitiflorus (Nees ex Torr.) C.B.Clarke
  • Mariscus dissitiflorus var. lucidior C.B.Clarke
  • Mariscus pallens Liebm.
  • Mariscus thyrsiflorus (Jungh. ex Schltdl.) T.Koyama
  • Mariscus tribrachiatus Liebm.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.