Triglochin striataRuiz & Pav.

three-rib arrowgrass

WFO wfo-0000770206 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Triglochin striata, photographed by Arnim Littek
fig. a Arnim Littek, CC BY 4.0 / 2022-06-12 / obs. 205702853
Triglochin striata, photographed by Arnim Littek
fig. b Arnim Littek, CC BY 4.0 / obs. 201484429
Triglochin striata, photographed by Arnim Littek
fig. c Arnim Littek, CC BY 4.0 / obs. 198055351
Triglochin striata, photographed by Kym Nicolson
fig. d Kym Nicolson, CC BY 4.0 / obs. 194402419
Triglochin striata, photographed by Arnim Littek
fig. e Arnim Littek, CC BY 4.0 / obs. 194255801
Triglochin striata, photographed by Joe Dillon
fig. f Joe Dillon, CC BY 4.0 / obs. 191477775
Triglochin striata, photographed by Arnim Littek
fig. g Arnim Littek, CC BY 4.0 / obs. 189698139
Triglochin striata, photographed by Arnim Littek
fig. h Arnim Littek, CC BY 4.0 / obs. 189995369

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.

The specimen a real sheet, in a real collection

Herbarium
The New York Botanical Garden
Accession
423677
Filed as
Triglochin striata Ruiz & Pav.
Det. by
R. R. Haynes; L. B. Holm-Nielsen 1985-01-01
Collected
B. D. Sucre 1965-08-14
Origin
BR
The sheet
View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 40 botanical countries

Regions where Triglochin striata is native: Angola, Cape Provinces, DR Congo, KwaZulu-Natal, Mozambique, Namibia, Chatham Is., New South Wales, New Zealand North, New Zealand South, Norfolk Is., Queensland, South Australia, Tasmania, Victoria, Western Australia, Alabama, California, Florida, Georgia, Louisiana, Maryland, Mississippi, North Carolina, Oregon, South Carolina, Virginia, Tubuai Is., Argentina Northeast, Argentina Northwest, Argentina South, Bahamas, Bolivia, Brazil South, Brazil Southeast, Chile Central, Chile North, Cuba, Peru, Uruguay AngolaCape ProvincesDR CongoKwaZulu-NatalMozambiqueNamibiaNew South WalesNew Zealand NorthNew Zealand SouthQueenslandSouth AustraliaTasmaniaVictoriaWestern AustraliaAlabamaCaliforniaFloridaGeorgiaLouisianaMarylandMississippiNorth CarolinaOregonSouth CarolinaVirginiaArgentina NortheastArgentina NorthwestArgentina SouthBoliviaBrazil SouthBrazil SoutheastChile CentralChile NorthCubaPeruUruguay Chatham Is.Norfolk Is.Tubuai Is.Bahamas
Native distribution of Triglochin striata, 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
Bolivia BOL
Brazil South BZS
Brazil Southeast BZL
Chile Central CLC
Chile North CLN
Cuba CUB
Peru PER
Uruguay URU
Alabama ALA NORTHERN AMERICA
California CAL
Florida FLA
Georgia GEO
Louisiana LOU
Maryland MRY
Mississippi MSI
North Carolina NCA
Oregon ORE
South Carolina SCA
Virginia VRG
Chatham Is. CTM AUSTRALASIA
New South Wales NSW
New Zealand North NZN
New Zealand South NZS
Norfolk Is. NFK
Queensland QLD
South Australia SOA
Tasmania TAS
Victoria VIC
Western Australia WAU
Angola ANG AFRICA
Cape Provinces CPP
DR Congo ZAI
KwaZulu-Natal NAT
Mozambique MOZ
Namibia NAM
Tubuai Is. TUB PACIFIC

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 110 in flower of 512 examined

Peak flowering in Jul. Each bar is the share of Triglochin striata 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. 110 of 512 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 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 1,288 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 3.6 °C 7.4 °C 12.2 °C
Warmest month, mean daily high 17.1 °C 20.7 °C 27.9 °C
Annual rainfall 566 mm 1,166 mm 2,131 mm
Rainfall in the driest quarter 76 mm 218 mm 355 mm

It is found where winters are cool but frost is light or absent. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 1,288 research-grade observations of Triglochin striata 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 28 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.

  • Abbotia filiformis Raf.
  • Triglochin atacamensis Phil.
  • Triglochin decipiens R.Br.
  • Triglochin decipiens f. major Endl.
  • Triglochin decipiens f. minor Endl.
  • Triglochin densiflora Dombey ex Kunth
  • Triglochin filifolia Sieber ex Spreng.
  • Triglochin flaccida A.Cunn.
  • Triglochin floridana Gand.
  • Triglochin lechleri Steud.
  • Triglochin litorea Phil.
  • Triglochin littoralis Phil. ex Micheli
  • Triglochin montevidensis Spreng.
  • Triglochin natalensis Gand.
  • Triglochin neozelandica Gand.
  • Triglochin philippii Gand.
  • Triglochin pumila Larrañaga
  • Triglochin pycnostachya Gand.
  • Triglochin sessilis Gand.
  • Triglochin striata var. filifolia (Siebold ex Spreng.) Micheli
  • Triglochin striata var. filifolia (Sieber ex Spreng.) Micheli
  • Triglochin striata var. humilis Micheli
  • Triglochin striata var. montevidensis (Spreng.) Buchenau
  • Triglochin striata var. robustior Micheli

and 4 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.