Paspalum distichumL.

Buffalo Quick PaspalumCouch PaspalumKnotgrassMercer GrassWater Couchknotgrass

WFO wfo-0000887584 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Paspalum distichum, photographed by 葉子
fig. a 葉子, CC0 1.0 / 2021-09-08 / obs. 173597073

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 70 botanical countries

Regions where Paspalum distichum is native: Alabama, Arizona, Arkansas, California, Florida, Georgia, Idaho, Kansas, Kentucky, Louisiana, Maryland, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Nevada, New Jersey, New Mexico, North Carolina, Oklahoma, Oregon, Pennsylvania, South Carolina, Tennessee, Texas, Utah, Virginia, Washington, Argentina Northeast, Argentina Northwest, Argentina South, Bahamas, Bermuda, Bolivia, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Central American Pacific Is., Chile Central, Chile North, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Galápagos, Guatemala, Guyana, Haiti, Honduras, Jamaica, Juan Fernández Is., Leeward Is., Nicaragua, Paraguay, Peru, Puerto Rico, Suriname, Trinidad-Tobago, Turks-Caicos Is., Uruguay, Venezuela, Windward Is. AlabamaArizonaArkansasCaliforniaFloridaGeorgiaIdahoKansasKentuckyLouisianaMarylandMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestMississippiMissouriNevadaNew JerseyNew MexicoNorth CarolinaOklahomaOregonPennsylvaniaSouth CarolinaTennesseeTexasUtahVirginiaWashingtonArgentina NortheastArgentina NorthwestArgentina SouthBoliviaBrazil NorthBrazil NortheastBrazil SouthBrazil SoutheastBrazil West-CentralCentral American Pacific Is.Chile CentralChile NorthColombiaCosta RicaCubaDominican RepublicEcuadorEl SalvadorGuatemalaGuyanaHaitiHondurasJamaicaNicaraguaParaguayPeruPuerto RicoSurinameTrinidad-TobagoUruguayVenezuela BahamasBermudaGalápagosLeeward Is.Turks-Caicos Is.Windward Is.
Native distribution of Paspalum distichum, 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. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Argentina Northeast AGE SOUTHERN AMERICA
Argentina Northwest AGW
Argentina South AGS
Bahamas BAH
Bermuda BER
Bolivia BOL
Brazil North BZN
Brazil Northeast BZE
Brazil South BZS
Brazil Southeast BZL
Brazil West-Central BZC
Central American Pacific Is. CPI
Chile Central CLC
Chile North CLN
Colombia CLM
Costa Rica COS
Cuba CUB
Dominican Republic DOM
Ecuador ECU
El Salvador ELS
Galápagos GAL
Guatemala GUA
Guyana GUY
Haiti HAI
Honduras HON
Jamaica JAM
Juan Fernández Is. JNF
Leeward Is. LEE
Nicaragua NIC
Paraguay PAR
Peru PER
Puerto Rico PUE
Suriname SUR
Trinidad-Tobago TRT
Turks-Caicos Is. TCI
Uruguay URU
Venezuela VEN
Windward Is. WIN
Alabama ALA NORTHERN AMERICA
Arizona ARI
Arkansas ARK
California CAL
Florida FLA
Georgia GEO
Idaho IDA
Kansas KAN
Kentucky KTY
Louisiana LOU
Maryland MRY
Mexico Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
Mississippi MSI
Missouri MSO
Nevada NEV
New Jersey NWJ
New Mexico NWM
North Carolina NCA
Oklahoma OKL
Oregon ORE
Pennsylvania PEN
South Carolina SCA
Tennessee TEN
Texas TEX
Utah UTA
Virginia VRG
Washington WAS

Not drawn on the map: Juan Fernández Is.. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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.

Flowering 75 in flower of 92 examined

Proportion of examined Paspalum distichum in flower, by month
Month In flower Examined Share 95% interval
Jan 2 4 too few examined
Feb 13 14 93% 69% to 99%
Mar 7 9 78% 45% to 94%
Apr 4 4 too few examined
May 2 3 too few examined
Jun 4 6 67% 30% to 90%
Jul 6 7 86% 49% to 97%
Aug 14 16 88% 64% to 97%
Sep 10 13 77% 50% to 92%
Oct 10 11 91% 62% to 98%
Nov 2 3 too few examined
Dec 1 2 too few examined

Peak flowering in Feb. Each bar is the share of Paspalum distichum observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 75 of 92 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Where it actually grows measured, from 884 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -0.2 °C 5.8 °C 12.9 °C
Warmest month, mean daily high 20.1 °C 26.6 °C 34.4 °C
Annual rainfall 388 mm 916 mm 2,337 mm
Rainfall in the driest quarter 5 mm 139 mm 351 mm

It is found where winters bring light frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 884 research-grade observations of Paspalum distichum that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 35 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.

  • Anastrophus paspalodes (Michx.) Nash
  • Digitaria disticha (L.) Fiori & Paol.
  • Digitaria paspalodes Michx.
  • Dimorphostachys oajacensis (Steud.) E.Fourn. ex Hemsl.
  • Milium distichum (L.) Muhl.
  • Milium paspalodes (Michx.) Elliott
  • Panicum digitaria (Poir.) Latirr.
  • Panicum digitarioides Raspail ex Steud.
  • Panicum fernandezianum Colla
  • Panicum paspaliforme J.Presl
  • Panicum polyrrhizum J.Presl
  • Paspalum berteroanum Balb. ex Colla
  • Paspalum bracteatum Dufour ex Kunth
  • Paspalum chepica Steud.
  • Paspalum digitaria Poir.
  • Paspalum distichum subsp. paspalodes (Michx.) Thell.
  • Paspalum distichum subsp. paucispicatum (Vasey) Verloove & Reynders
  • Paspalum distichum var. digitaria (Poir.) Hack.
  • Paspalum distichum var. indutum Shinners
  • Paspalum distichum var. longirepens Domin
  • Paspalum distichum var. microstachyum Domin
  • Paspalum distichum var. paspalodes (Michx.) Thell.
  • Paspalum elliottii S.Watson
  • Paspalum fernandezianum Colla

and 11 more.

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.