The following Participating Institutions are custodians for this species in the CPC National Collection:
Harold L. Lyon Arboretum
The conservation of Xylosma crenata is fully sponsored.
Nellie Sugii contributed to this Plant Profile.
Xylosma crenatum is a unisexual (produces either male or female flowers) tree which grows up to 46 feet tall. It was first collected in 1917 by Charles Forbes but remained undiscovered for decades due to a misidentification. Over 50 years later, a second collection was made in 1968 by Robert Hobdy along the banks of Mohihi Stream at the edge of Alakai Swamp, Kaua`i. It was later recognized as a separate distinct species in 1972. Currently, it is known only from the island of Kaua`i in 4 different populations consisting of a total of 13 individuals. Two of these populations have only a single plant. Very little is known about this species as to when it flowers, what pollinates it, how long it lives, and what kind of environmental requirements are needed in order for it to grow properly.
Distribution & Occurrence
Diverse koa-ohia montane mesic forest at an elevation of about 975-1,065 meters. Sometimes along stream banks. (USFWS 1995)
Honopu Valley in Kokee State Park, Kaua`i
Nawaimaka Valley in Na Pali Kona forest Reserve, Kaua`i
Mahanaloa Valley, Kaua`i
Nualolo Trail, Kau
|1 site (Kaua`i)
Conservation, Ecology & Research
Small population size
Plans are being made to outplant this species. (USFWS 1995)
In January, 2002, the U.S. Fish and Wildlife Service determined that a designation of critical habitat was prudent for this species. (USFWS 2002)
Alien plant species control
(USFWS 1995, 2001)
Biological and physiological studies
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. 1990. Proposed Endangered Status for Six Plants from the Kokee Region, Island of Kauai, Hawaii. Federal Register. 55, 187: 39301-39310.