The following Participating Institutions are custodians for this species in the CPC National Collection:
Harold L. Lyon Arboretum
The conservation of Hesperomannia arbuscula is fully sponsored.
Nellie Sugii contributed to this Plant Profile.
Hesperomannia arbuscula is a member of a rare and endemic genus found in the dry forest areas of the south and central Wai`anae Mountains on O`ahu and Iao Valley on Mau`i. On O`ahu, the 3 remaining populations is known to occur within an area of only about 10 square miles. It is a small, shrubby tree which grows to about 6-10 feet in height and bears beautiful clusters of erect thistle-like heads, each made up of many yellow to yellow-brown florets. Its closest relatives are from the New World, probably in South America. The genus Hesperomannia is thought to be one of the early immigrants to the Hawaiian Islands.
Distribution & Occurrence
Typically grows on slopes and ridges in mesic to wet forests at an elevation of 350 to 900 meters. (Wagner et. al 1999) and (USFWS 1998).
Kalua`a Gulch, O`ahu
Kapuna Gulch, O`ahu
Iao Valley, West Mau`i
|2 sites (O`ahu and M`aui)
Conservation, Ecology & Research
Reduced reproductive vigor due to small population size
(USFWS 1998, 2001)
Propagation (Harold L. Lyon Arboretum, National Tropical Botanical Garden)
(USFWS 1998) and (Nellie Sugii Pers. Comm. 2001)
In April, 2002, the U.S. Fish and Wildlife Service determined that a designation of critical habitat was prudent for this species. (USFWS 2002)
Feral and domestic animal control
Biology and physiology study
1999. Joint Effort to Save Rare Plant. The Kukui Leaf. XXVI, 3,4: 5, 8.
Schulz, T.T.; Carpenter, A.T. Monitoring survival, Growth, and Reproduction of Aletes humilis. Gen. Tech. Rep. RM-GTR-283. Proceedings of the Southwestern Rare and Endangered Plant Conference; September 11-14; Flagstaff, AZ. In: Maschinski, J.; Hammond, H
USFWS. 1991. Determination of Endangered Status for 26 Plants From the Waianae Mountains, Island of Oahu, Hawaii. Federal Register. 56: 55770-55786.
USFWS. 2000. Determinations of Prudency and Designations of Critical Habitat for Plant Species From the Islands of Maui and Kahoolawe, Hawaii. Federal Register. 65, 243: 143.
USFWS. 2002. Designations of Critical Habitat for Plant Species From the Island of Oahu, Hawaii. Federal Register. 67, 102: 37108-37156.
USFWS. 2002. Revised Determinations of Prudency and Proposed Designations of Critical Habitat for Plant Species From the Islands of Maui and Kahoolawe. Federal Register. 67, 64: 15856-15987.
Weber, W.A. 1984. New names and combinations, principally in the Rocky Mountain flora--IV. Phytologia. 55: 1-11.