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Isoetes taiwanensis; photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY) CC BY(c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY) · observed growing wild · 2026-06-19

Isoetes taiwanensis De Vol

Taiwan Quillwort

Isoetaceae · Taiwan

No habitat climate
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Isoetes taiwanensis, photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY)Isoetes taiwanensis, photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY)Isoetes taiwanensis, photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY)Isoetes taiwanensis, photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY)Isoetes taiwanensis, photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY)Isoetes taiwanensis, photograph (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY) 32 photographs ›

Summary

Isoetes taiwanensis is a species of plant in the family Isoetaceae. It is endemic to Taiwan, and the only species of quillwort there. Isoetes taiwanensis can now only be found in Menghuan Pond in Taipei's Yangmingshan National Park.

Quoted from Wikipedia, "Isoetes taiwanensis", CC BY-SA 4.0.

Cultivation

Nothing derived: no habitat climate for this species.

Climate across the habitat

No habitat climate can be derived: 24 in-range records, none placed to within 10 km. 24 of the 24 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.
NativeTaiwan · 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 marker25.083, 121.545 · in the densest population, 24 records (100% of those in range)
Kew's description“helophyte” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 24 georeferenced records inside the native range; the map shows only the 5 openly licensed ones, which alone would put the marker 2 km away. 12 records outside the WCVP native range not used. No climate across the range is derived for this species. 24 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.
Other GBIF keysRecords also from GBIF's key 3585093 (Isoetes taiwanensis DeVol): Kew's file holds it as Isoetes taiwanensis De Vol (accepted); 2 records, from GBIF's search API on the day of the build.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population of the 24 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Isoetes taiwanensis, photograph 1did not loadIsoetes taiwanensis, photograph 2did not loadIsoetes taiwanensis, photograph 3did not loadIsoetes taiwanensis, photograph 4did not loadIsoetes taiwanensis, photograph 5did not loadIsoetes taiwanensis, photograph 6did not load

Photographs: (c) 曾昱承 Yu-Cheng Zeng, some rights reserved (CC BY) (6).

Other Isoetes 7 in the reference

Isoetes echinospora Isoetes echinospora Spring quillwort Photo: CC BY, Valerii GlazunovIsoetes histrix Isoetes histrix Land Quillwort Photo: CC BY, Mehdi ChetibiIsoetes lacustris Isoetes lacustris Lake quillwort Photo: CC BY, Micki ColbeckIsoetes longissima Isoetes longissima Veiled Quillwort Photo: CC BY, Julien Renoult Isoetes malinverniana Piedmont Quillwort Isoetes sinensis Narrow quillwort Isoetes yunguiensis Isoetaceae

Names & registers

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Isoetaceae
Described by
De Vol
Native to
Taiwan
Wild records
24 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 answeredasked 2026-10-22GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 2 records of GBIF's key 3585093, Isoetes taiwanensis DeVol (Kew's file holds it as Isoetes taiwanensis De Vol (accepted)): GBIF occurrence search API
Habitat climate climate nothing to reportasked 2026-10-2224 in-range records, none placed to within 10 km
Wikidata wikidata answeredasked 2026-10-22found by its label; its IPNI identifier 17441280-1 is Kew's for Isoetes taiwanensis De Vol
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.

Cultifolio

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