Stenogyne campanulata is a rare species of flowering plant in the mint family

Lamiaceae

The mints, taxonomically known as Lamiaceae or Labiatae, are a family of flowering plants. They have traditionally been considered closely related to Verbenaceae, but in the 1990s, phylogenetic studies suggested that many genera classified in Verbenaceae belong instead in Lamiaceae...

 known by the common name Kalalau Valley stenogyne. It is endemic to 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...

, where it is known only from the Kalalau Valley

Kalalau Valley

The Kalalau Valley is located on the northwest side of the island of Kauai in the state of Hawaii. The valley is located in the Nā Pali Coast State Park and houses the beautiful Kalalau Beach. The Nā Pali Coast is very rugged and is inaccessible to automobiles...

 on 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",...

. It is a federally listed endangered species

Endangered species

An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters...

 of the United States.

This plant was first discovered in 1986 growing on a Kalalau Valley cliff in Na Pali Coast State Park

Na Pali Coast State Park

Nā Pali Coast State Park encompasses of land and is located in the center of the rugged along the northwest side of Kauai, the oldest inhabited Hawaiian island. The Nā Pali coast itself extends southwest starting at Kee Beach extending all the way to Polihale State Park. The pali rise as high as...

, and it was described to science as a new species in 1989. As of 2006 there was only a single population containing about 50 individuals. The plant is threatened by habitat degradation caused by feral pigs and introduced plant species

Introduced species

An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...

 such as air plant

Kalanchoe pinnata

Kalanchoe pinnata is a succulent plant native to Madagascar...

(Kalanchoe pinnata).