Cyperus pennatiformis
species of plant
Cyperus pennatiformis (formerly Mariscus pennatiformis) is a rare species of sedge known by the common name coastal flatsedge. It is endemic to Hawaii, where it grows on the islands of Maui, Kauai, and Laysan. It is a federally listed endangered species of the United States.
This sedge grows 40 centimeters to 1.2 meters tall with leathery leaves as long as the stem or longer. The flower cluster atop the stem is umbrella-shaped and up to 15 centimeters long by 25 wide. It contains up to 18 spikes which are each made up of several yellowish or grayish spikelets. The spikelet contains up to 25 flowers.
Today, this plant grows on Maui, Kauai, and Laysan; it has recently been extirpated from Oahu and the island of Hawaii. The most recent surveys found about 30 individual plants on Maui and four populations on Kauai; these represent the subspecies pennatiformis. On Laysan the plants are of subspecies bryanii, known as Laysan sedge or Bryan's sedge.
The public source identifies “Cyperus pennatiformis” as species of plant. This brief keeps that definition visible, then builds a research path around Cyperus, pennatiformis and species.
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Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Aug 12, 2026. The linked authority identifier is Q5200208. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Cyperus pennatiformis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.