[2] It is endemic to Hawaii, where it is known only from the Waianae Range on the island of Oahu.

[1] It is a federally listed endangered species of the United States.

This plant was feared extinct when the last known individuals died in 1996.

[3] This Hawaiian mint is a woolly vine which can reach 1 or 2 meters in length.

The plant produces tubular flowers which may be over 4 centimeters long.