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Crinum thaianum; photograph (c) Utain Pummarin, some rights reserved (CC BY) CC BY(c) Utain Pummarin, some rights reserved (CC BY) · observed growing wild · 2023-10-21

Crinum thaianum J.Schulze

Onion Plant; Thai Water Onion; Water Onion

Amaryllidaceae · Thailand · listed by its family as a bulb, tuber or caudex

No habitat climate
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Crinum thaianum, photograph (c) Utain Pummarin, some rights reserved (CC BY)Crinum thaianum, photograph (c) Utain Pummarin, some rights reserved (CC BY)Crinum thaianum, photograph (c) Utain Pummarin, some rights reserved (CC BY)Crinum thaianum, photograph (c) Utain Pummarin, some rights reserved (CC BY)Crinum thaianum, photograph (c) Utain Pummarin, some rights reserved (CC BY)Crinum thaianum, photograph (c) Utain Pummarin, some rights reserved (CC BY) 12 photographs ›

Summary

Crinum thaianum, also called the Thai onion plant or water onion, or Phlap Phueng Than, is an emergent plant species, endemic to the coastal plain of Ranong and Phang Nga Provinces, Thailand. Its natural habitat is to grow along the banks of flowing, medium- to fast-running streams, where its roots and bulb are submerged in the sediment, while its leaves grow long in the current and can access fresh air at the surface. When in bloom, the flower is an umbel of large, showy blossoms above the waterline. These growth habits make it a popular addition for tropical aquaria, and it is sold in many regions to be used specifically for growth within displays of tropical fish. More on Wikipedia ›

Quoted from Wikipedia, "Crinum thaianum", CC BY-SA 4.0.

About the genus · Crinum

Crinum is a genus of about 180 species of perennial plants that have large showy flowers on leafless stems, and develop from bulbs. They are found in seasonally moist areas, including marshes, swamps, depressions and along the sides of streams and lakes in tropical and subtropical areas worldwide.

Quoted from Wikipedia, "Crinum", CC BY-SA 4.0.

Cultivation

Grouped as a bulb, tuber or caudex, listed under the family Amaryllidaceae in the archetype table, and Kew describes it as “bulbous geophyte or helophyte”.

Nothing derived: no habitat climate for this species.
How this section is made

Each card states this species' habitat figures with their sources, and what two fixed rules read from them; nothing here says what the plant does, wants or tolerates. The rules · the terms.

Group. Listed under the family Amaryllidaceae in the archetype table, and Kew describes it as “bulbous geophyte or helophyte”. A group is taken only where Kew's description of the species agrees with the table's listing. The table gives no figure and no prose; the cold floor is the habitat's alone.

Climate across the habitat

No habitat climate can be derived: 19 in-range records, none placed to within 10 km. 19 of the 19 in-range records are placed to worse than 10 km, or to no stated accuracy and fewer than three decimals or by something other than a person's observation, and cannot place a climate cell, though they count for the map and its marker.

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing.
Openly licensed records inside the range, framed on where they fall.
NativeThailand · regions are the level-3 units of the World Geographical Scheme for Recording Plant Distributions, as Kew's World Checklist records ranges, some under historical names such as Yugoslavia or Czechoslovakia (how).
Map marker9.369, 98.563 · in the densest population, 17 records (89% of those in range)
Kew's description“bulbous geophyte or helophyte” · “wet tropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 19 georeferenced records inside the native range; the map shows only the 5 openly licensed ones, which alone would put the marker 10 km away. No climate across the range is derived for this species. 19 in-range records are placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stay on the map but off the climate.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population of the 19 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Crinum thaianum, photograph 1did not loadCrinum thaianum, photograph 2did not loadCrinum thaianum, photograph 3did not loadCrinum thaianum, photograph 4did not loadCrinum thaianum, photograph 5did not loadCrinum thaianum, photograph 6did not load

Photographs: (c) Utain Pummarin, some rights reserved (CC BY) (6).

Other Crinum 22 in the reference

Crinum × amabile Crinum × amabile Amaryllidaceae Photo: CC BY, Raúl A. Ruiz M.Crinum americanum Crinum americanum Seven sisters Photo: CC BY, Jody ShugartCrinum amoenum Crinum amoenum Amaryllidaceae Photo: CC BY, desertnaturalistCrinum asiaticum Crinum asiaticum Poisonbulb Photo: CC BY, ian_mcallan Crinum balfourii Amaryllidaceae Crinum bulbispermum Crinum bulbispermum Hardy swamplily Photo: CC0, author not statedCrinum calamistratum Crinum calamistratum Amaryllidaceae Photo: CC0, DaderotCrinum campanulatum Crinum campanulatum Albany Swamplily Photo: CC BY, Henry de LangeCrinum erubescens Crinum erubescens Amaryllidaceae Photo: CC0, author not stated Crinum firmifolium Amaryllidaceae Crinum flaccidum Crinum flaccidum Darling Lily Photo: CC BY-SA, Ruth PalssonCrinum graminicola Crinum graminicola Grass Crinum Photo: CC0, author not stated all 23 ›

Names & registers

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Amaryllidaceae
Described by
J.Schulze
Native to
Thailand
Wild records
19 in range · 5 open

Every figure here is derived from public data by a stated rule and names its source; nothing about this species is written for its page by a person or by AI, apart from the marked, credited quotations. How →

Where this page came from built 2026-10-22
GBIF species record gbif.species answeredasked 2026-10-22
GBIF synonyms gbif.synonyms answeredasked 2026-10-22
GBIF common names gbif.vernacular answeredasked 2026-10-22names fetched 2026-10-22
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21
Habitat climate climate nothing to reportasked 2026-10-2219 in-range records, none placed to within 10 km
Wikidata wikidata answeredasked 2026-10-22
Wikipedia wikipedia answeredasked 2026-10-22
iNaturalist photographs, wild inat.photos.wild answeredasked 2026-10-22from iNaturalist's open data of 2026-09-27: research-grade observations with an open-licence photograph, the 24 whose photographs iNaturalist received last (the open data holds no votes); filled 2026-10-22
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-22none of the photographs on this page is credited to GBIF: those shown are other sources', and GBIF's were the same photographs or were set aside by the photograph rules
OpenAlex papers openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshot

Every source is recorded as having answered, reported nothing, refused, failed, not been asked, or answered twice where one answer is taken (“not taken: two items answered”), and, for a source asked when this page was built, when: the figures are as the source held them that day; a source read from a file (Kew's World Checklist, a GBIF download) says "as of" the file's day instead; a row carried from an earlier build of the page names that build instead. Only “nothing to report” is ever shown as an absence. Records came from 4 datasets via GBIF.org; each carries its own licence.

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