Hibiscus waimeae is a species of flowering plant

Flowering plant

The flowering plants , also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies...

 in the okra

Okra

Okra is a flowering plant in the mallow family. It is valued for its edible green seed pods. The geographical origin of okra is disputed, with supporters of South Asian, Ethiopian and West African origins...

 family, Malvaceae

Malvaceae

Malvaceae, or the mallow family, is a family of flowering plants containing over 200 genera with close to 2,300 species. Judd & al. Well known members of this family include okra, jute and cacao...

, that is endemic to the island of Kauai

Kauai

Kauai or Kauai, known as Tauai in the ancient Kaua'i dialect, is geologically the oldest of the main Hawaiian Islands. With an area of , it is the fourth largest of the main islands in the Hawaiian archipelago, and the 21st largest island in the United States. Known also as the "Garden Isle",...

 in Hawaii

Hawaii

Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...

. It is a small gray-barked tree

Tree

A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to...

, reaching a height of 6–10 m (19.7–32.8 ft) and a trunk diameter of 0.3 m (0.984251968503937 ft). The flower

Flower

A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...

s last for a single day, starting out white and fading to pink in the afternoon. H. arnottianus of Oahu

Oahu

Oahu or Oahu , known as "The Gathering Place", is the third largest of the Hawaiian Islands and most populous of the islands in the U.S. state of Hawaii. The state capital Honolulu is located on the southeast coast...

 and Molokai

Molokai

Molokai or Molokai is an island in the Hawaiian archipelago. It is 38 by 10 miles in size with a land area of , making it the fifth largest of the main Hawaiian Islands and the 27th largest island in the United States. It lies east of Oahu across the 25-mile wide Kaiwi Channel and north of...

 and H. waimeae are the only Hawaiian hibiscus

Hawaiian hibiscus

Hawaiian hibiscus are the seven known species of hibiscus regarded as native to Hawaii. Although tourists regularly associate the hibiscus flower with their experiences visiting the US state of Hawaii, and the plant family Malvaceae includes a relatively large number of species that are native to...

es that have white flowers. H. waimeae inhabits coastal mesic, mixed mesic, and wet forests at elevations of 250 –.

H. w. waimeae can be found in the western and southwestern parts of the island, where it grows in the Waimea Canyon

Waimea Canyon State Park

Waimea Canyon, also known as the Grand Canyon of the Pacific, is a large canyon, approximately ten miles long and up to 3,000 feet deep, located on the western side of Kauai in the Hawaiian Islands. Waimea is Hawaiian for "reddish water," a reference to the erosion of the canyon's red soil...

 area and valleys that face the ocean. H. waimeae hannerae is rarer (listed as endangered

Endangered Species Act

The Endangered Species Act of 1973 is one of the dozens of United States environmental laws passed in the 1970s. Signed into law by President Richard Nixon on December 28, 1973, it was designed to protect critically imperiled species from extinction as a "consequence of economic growth and...

 by the USFWS

United States Fish and Wildlife Service

The United States Fish and Wildlife Service is a federal government agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats...

) and can be found in the northwestern part of the island where it grows in the Hanakapiai, Limahuli, and Kalihi Wai valleys.