Rotala ramosior(L.) Koehne

lowland rotala

WFO wfo-0000404304 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Rotala ramosior, photographed by natalie
fig. a natalie, CC0 1.0 / 2021-10-05 / obs. 161945559
Rotala ramosior, photographed by Ryan Sorrells
fig. b Ryan Sorrells, CC BY 4.0 / obs. 153598099
Rotala ramosior, photographed by Thomas Koffel
fig. c Thomas Koffel, CC BY 4.0 / obs. 93651212
Rotala ramosior, photographed by Henrique Pacheco
fig. d Henrique Pacheco, CC BY 4.0 / obs. 53765297
Rotala ramosior, photographed by Nolan Exe
fig. e Nolan Exe, CC BY 4.0 / obs. 52259672
Rotala ramosior, photographed by Sam Kieschnick
fig. f Sam Kieschnick, CC BY 4.0 / obs. 47787358
Rotala ramosior, photographed by Kevin Faccenda
fig. g Kevin Faccenda, CC BY 4.0 / obs. 102594682
Rotala ramosior, photographed by Sam Kieschnick
fig. h Sam Kieschnick, CC BY 4.0 / obs. 9737641

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 75 botanical countries

Regions where Rotala ramosior is native: Alabama, Arizona, Arkansas, British Columbia, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Virginia, Washington, West Virginia, Wisconsin, Argentina Northeast, Belize, Bolivia, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Haiti, Honduras, Jamaica, Leeward Is., Netherlands Antilles, Nicaragua, Panamá, Paraguay, Peru, Puerto Rico, Trinidad-Tobago, Venezuela, Venezuelan Antilles, Windward Is. AlabamaArizonaArkansasBritish ColumbiaCaliforniaColoradoConnecticutFloridaGeorgiaIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMarylandMassachusettsMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestMichiganMinnesotaMississippiMissouriMontanaNebraskaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaOhioOklahomaOntarioOregonPennsylvaniaSouth CarolinaSouth DakotaTennesseeTexasVirginiaWashingtonWest VirginiaWisconsinArgentina NortheastBelizeBoliviaColombiaCosta RicaCubaDominican RepublicEcuadorEl SalvadorGuatemalaHaitiHondurasJamaicaNicaraguaPanamáParaguayPeruPuerto RicoTrinidad-TobagoVenezuela DelawareDistrict of ColumbiaRhode I.Leeward Is.Netherlands AntillesVenezuelan AntillesWindward Is.
Native distribution of Rotala ramosior, 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
Alabama ALA NORTHERN AMERICA
Arizona ARI
Arkansas ARK
British Columbia BRC
California CAL
Colorado COL
Connecticut CNT
Delaware DEL
District of Columbia WDC
Florida FLA
Georgia GEO
Idaho IDA
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Louisiana LOU
Maryland MRY
Massachusetts MAS
Mexico Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
Michigan MIC
Minnesota MIN
Mississippi MSI
Missouri MSO
Montana MNT
Nebraska NEB
New Hampshire NWH
New Jersey NWJ
New Mexico NWM
New York NWY
North Carolina NCA
Ohio OHI
Oklahoma OKL
Ontario ONT
Oregon ORE
Pennsylvania PEN
Rhode I. RHO
South Carolina SCA
South Dakota SDA
Tennessee TEN
Texas TEX
Virginia VRG
Washington WAS
West Virginia WVA
Wisconsin WIS
Argentina Northeast AGE SOUTHERN AMERICA
Belize BLZ
Bolivia BOL
Colombia CLM
Costa Rica COS
Cuba CUB
Dominican Republic DOM
Ecuador ECU
El Salvador ELS
Guatemala GUA
Haiti HAI
Honduras HON
Jamaica JAM
Leeward Is. LEE
Netherlands Antilles NLA
Nicaragua NIC
Panamá PAN
Paraguay PAR
Peru PER
Puerto Rico PUE
Trinidad-Tobago TRT
Venezuela VEN
Venezuelan Antilles VNA
Windward Is. WIN

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 59 in flower of 106 examined

Peak flowering in Sep. Each bar is the share of Rotala ramosior 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. 59 of 106 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 7 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.

Also published as 19 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.

  • Ammannia catholica Hook. & Arn. ex Seem.
  • Ammannia dentifera A.Gray
  • Ammannia humilis Michx.
  • Ammannia linearifolia Raf.
  • Ammannia monoflora Blanco
  • Ammannia multicaulis Raf.
  • Ammannia occidentalis (Spreng.) DC.
  • Ammannia occidentalis var. pygmaea Chapm.
  • Ammannia ramosa Hill
  • Ammannia ramosior L.
  • Boykiana humilis (Michx.) Raf.
  • Boykinia humilis Raf. ex S.Watson
  • Boykinia humilis (Michx.) Raf.
  • Peplis occidentalis Spreng.
  • Rotala dentifera (A.Gray) Koehne
  • Rotala ramosior var. dentifera (A.Gray) Lundell
  • Rotala ramosior var. interior Fernald & Griscom
  • Rotala ramosior var. ramosior
  • Rotala ramosior var. typica Fernald & Griscom

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.