Psychotria hexandra subsp. oahuensis
Federally Listed as a Candidate Species
Genetic Safety Net Species
Hawai‘i Natural Heritage Ranking‐ Imperiled;
Subspecies Critically Imperiled (G2T1)
Endemism – O‘ahu
SPECIES INFORMATION: Tree or shrub up to 6 m tall. Flowers unisexual, usually 6‐
merous, corolla white, apex acute in bud.
DISTRIBUTION: North Ko‘olau Mountains, O‘ahu.
ABUNDANCE: Three plants have been observed in the Ko‘olau Mountains.
LOCATION AND CONDITION OF KEY HABITAT: Lowland Metrosideros mixed
shrub/fern wet forest. Associated with Pritchardia martii, Syzygium sandwicensis, Melicope
clusifolia, Scaevola chammissoniana, Rhynchospora sclerioides,
and other Psychotria
Habitat degradation by feral pigs;
Fruit predation by rats;
Competition from alien plant species;
Reduced reproductive vigor due to the small number of remaining individuals.
: The goals of conservation actions are not only to protect
current populations, but also to establish new populations to reduce the risk of
extinction. In addition to common statewide and island conservation actions, specific
Survey historical range for surviving populations;
Establish secure ex‐situ stocks with complete representation of remaining
Augment wild population and establish new populations in safe harbors.
Continue surveys of population and distribution in known and likely habitats;
No Photo Available
Monitor plants for insect damage and plant diseases.
Develop proper horticultural protocols and pest management;
Survey ex‐situ holdings and conduct molecular fingerprinting;
Conduct pollination biology and seed dispersal studies;
Map genetic diversity in the surviving populations to guide future re‐
introduction and augmentation efforts.
Hawai‘i Natural Heritage Program. 2005. Hawaii Natural Heritage Program Search,
Wagner, W.L., Herbst, D.R., and Sohmer, S.H. 1999. Manual of the Flowering Plants of Hawaiʹi‐‐
Revised Edition. Honolulu, HI: University of Hawaii Press and Bishop Museum Press. 1853p.