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Cyperus trachysanthos; photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia Commons CC BYForest & Kim Starr, CC BY 3.0, via Wikimedia Commons

Cyperus trachysanthos Hook. & Arn.

Sticky flatsedge

Cyperaceae · Hawaii

No habitat climate
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Cyperus trachysanthos, photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia CommonsCyperus trachysanthos, photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia CommonsCyperus trachysanthos, photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia CommonsCyperus trachysanthos, photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia CommonsCyperus trachysanthos, photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia CommonsCyperus trachysanthos, photograph Forest & Kim Starr, CC BY 3.0, via Wikimedia Commons 12 photographs ›

Summary

Cyperus trachysanthos is a rare species of sedge known by the common names pu`uka`a and sticky flatsedge. It is endemic to Hawaii, where it is known from Kauai and Oahu. It was known from Niihau, Molokai and Lanai, but it has been extirpated from these islands. It is a federally listed endangered species of the United States.

Quoted from Wikipedia, "Cyperus trachysanthos", CC BY-SA 4.0.

Cultivation

Nothing derived: no habitat climate for this species.

Climate across the habitat

No habitat climate can be derived: 16 in-range records, none placed to within 10 km. 16 of the 16 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.
NativeHawaii · 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 marker21.422, -158.141 · in the densest population, 14 records (88% of those in range)
Kew's description“perennial or rhizomatous geophyte” · “wet tropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 16 georeferenced records inside the native range; the map shows only the 9 openly licensed ones, which alone would put the marker 22 km away. 1 record outside the WCVP native range not used. No climate across the range is derived for this species. 16 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 16 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Cyperus trachysanthos, photograph 1did not loadCyperus trachysanthos, photograph 2did not loadCyperus trachysanthos, photograph 3did not loadCyperus trachysanthos, photograph 4did not loadCyperus trachysanthos, photograph 5did not loadCyperus trachysanthos, photograph 6did not load

Photographs: Forest & Kim Starr, CC BY 3.0, via Wikimedia Commons (6).

Other Cyperus 73 in the reference

Cyperus acuminatus Cyperus acuminatus Taper-tip flatsedge Photo: CC BY, Frankie SimmonsCyperus aggregatus Cyperus aggregatus Inflatedscale flatsedge Photo: CC BY, Lucas CarboneCyperus alatus Cyperus alatus Cyperaceae Photo: CC0, author not statedCyperus albostriatus Cyperus albostriatus Dwarf umbrella-grass Photo: CC BY, Malte KrömerCyperus alternifolius Cyperus alternifolius Umbrella sedge Photo: CC0, author not statedCyperus aromaticus Cyperus aromaticus Navua sedge Photo: CC BY, Guillaume DelaitreCyperus articulatus Cyperus articulatus Jointed flatsedge Photo: CC BY, Cezanne SandersCyperus bipartitus Cyperus bipartitus Shining flatsedge Photo: CC BY, Nathan AaronCyperus brevifolius Cyperus brevifolius Globe Kyllinga Photo: CC0, author not statedCyperus byssaceus Cyperus byssaceus Cyperaceae Photo: CC BY, Agustina MedinaCyperus capitatus Cyperus capitatus Cyperaceae Photo: CC BY, Duarte Frade Cyperus cephalanthus Buttonbush flatsedge all 74 ›

Names & registers

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Cyperaceae
Described by
Hook. & Arn.
Native to
Hawaii
Wild records
16 in range · 9 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; 1 record within 1 km of a botanic garden, herbarium or zoo left out (1 at a herbarium; Wikidata's list)
Habitat climate climate nothing to reportasked 2026-10-2216 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 nothing to reportasked 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 nothing to reportasked 2026-10-22
Wikimedia Commons commons answeredasked 2026-10-22
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 5 datasets via GBIF.org; each carries its own licence.

Cultifolio

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