Halodule uninervis(Forssk.) Boiss.

Species code: Huhalodule

WFO wfo-0000769316 Accepted WFO 2026-06 5 photographs CC BY / CC BY-SA

Plate 1 figs. a–e · 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.

Halodule uninervis, photographed by Ewout Knoester
fig. a Ewout Knoester, CC BY-SA 4.0 / 2017-10-10 / obs. 21325457
Halodule uninervis, photographed by coenobita
fig. b coenobita, CC BY 4.0 / obs. 32083776
Halodule uninervis, photographed by Ewout Knoester
fig. c Ewout Knoester, CC BY-SA 4.0 / obs. 174783174
Halodule uninervis, photographed by Ewout Knoester
fig. d Ewout Knoester, CC BY-SA 4.0 / obs. 21325486
Halodule uninervis, photographed by Ewout Knoester
fig. e Ewout Knoester, CC BY-SA 4.0 / obs. 21325548

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 48 botanical countries

Regions where Halodule uninervis is native: Aldabra, Comoros, Egypt, Eritrea, Kenya, KwaZulu-Natal, Madagascar, Mauritius, Mozambique, Mozambique Channel Is., Seychelles, Socotra, Somalia, Sudan-South Sudan, Tanzania, Gulf States, Hainan, Iran, Nansei-shoto, Oman, Palestine, Saudi Arabia, Taiwan, Yemen, Andaman Is., Bangladesh, Borneo, India, Jawa, Lesser Sunda Is., Malaya, Maluku, Myanmar, New Guinea, Nicobar Is., Philippines, South China Sea, Sri Lanka, Sulawesi, Thailand, Vietnam, Queensland, Western Australia, Caroline Is., Fiji, Marianas, New Caledonia, Tonga EgyptEritreaKenyaKwaZulu-NatalMadagascarMozambiqueSomaliaSudan-South SudanTanzaniaGulf StatesHainanIranOmanPalestineSaudi ArabiaTaiwanYemenBangladeshBorneoIndiaJawaLesser Sunda Is.MalayaMalukuMyanmarNew GuineaPhilippinesSri LankaSulawesiThailandVietnamQueenslandWestern AustraliaFijiNew Caledonia AldabraComorosMauritiusMozambique Channel Is.SeychellesNansei-shotoAndaman Is.Nicobar Is.South China SeaCaroline Is.MarianasTonga
Native distribution of Halodule uninervis, 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
Andaman Is. AND ASIA-TROPICAL
Bangladesh BAN
Borneo BOR
India IND
Jawa JAW
Lesser Sunda Is. LSI
Malaya MLY
Maluku MOL
Myanmar MYA
New Guinea NWG
Nicobar Is. NCB
Philippines PHI
South China Sea SCS
Sri Lanka SRL
Sulawesi SUL
Thailand THA
Vietnam VIE
Aldabra ALD AFRICA
Comoros COM
Egypt EGY
Eritrea ERI
Kenya KEN
KwaZulu-Natal NAT
Madagascar MDG
Mauritius MAU
Mozambique MOZ
Mozambique Channel Is. MCI
Seychelles SEY
Socotra SOC
Somalia SOM
Sudan-South Sudan SUD
Tanzania TAN
Gulf States GST ASIA-TEMPERATE
Hainan CHH
Iran IRN
Nansei-shoto NNS
Oman OMA
Palestine PAL
Saudi Arabia SAU
Taiwan TAI
Yemen YEM
Caroline Is. CRL PACIFIC
Fiji FIJ
Marianas MRN
New Caledonia NWC
Tonga TON
Queensland QLD AUSTRALASIA
Western Australia WAU

Not drawn on the map: Socotra. 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.

Where it actually grows measured, from 55 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 14.5 °C 19.1 °C 25.3 °C
Warmest month, mean daily high 27.8 °C 29.1 °C 34.6 °C
Annual rainfall 410 mm 1,580 mm 2,493 mm
Rainfall in the driest quarter 3 mm 116 mm 502 mm

It is not found anywhere that gets close to freezing. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 55 research-grade observations of Halodule uninervis 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.

Also published as 13 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.

  • Cymodocea australis (Miq.) Trimen
  • Diplanthera indica Steud.
  • Diplanthera madagascariensis Steud.
  • Diplanthera tridentata Steinh.
  • Diplanthera uninervis (Forssk.) Asch.
  • Diplanthera uninervis F.N.Williams
  • Halodule australis Miq.
  • Halodule linearifolia Ohba & Miyata ex Kadono
  • Halodule tridentata (Steinh.) Endl. ex Unger
  • Phucagrostis tridentata Ehrenb. & Hemprich ex Boiss.
  • Zostera tridentata Ehrenberg & Hemprich
  • Zostera tridentata Solms
  • Zostera uninervis Forssk.

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.