This species has been recorded from the islands of Kauai, Maui, and Hawaii. It is known to be extant only on the Pohakuloa Training Area on Hawaii Island, in an area about 8 km in diameter. Fewer than 20,000 plants remain in this area. Threats to this species include alien plants and animals, human disturbance, and fire.
Threats to H. haplostachya include invasive introduced species, human disturbance, and fire (NatureServe 2001).
Number of Populations: 2 (USFWS 2001)
Number of Plants: >1000 (USFWS 2001)
There is an ongoing research at the Center for Ecological Management of Military Lands (CEMML). They are conducting an experiment to test the effectiveness of accelerated aging techniques to overcome seed dormancy and stimulate germination (CEMML 1997).
At Pu`u Kapele and Pu`u Ke`eke`e (Hawaii), fencing was proposed to protect significant populations of H. haplostachya. The first alternative alignment would entail construction of 1.03 miles of fence, while the second alternative would use 4.06 miles of fence. ""Fencing the larger area is the preferred alternative and the proposed action but is subject to the availability of funds,"" the Environmental Agency (EA) states (Tummons 1997).
The National Tropical Botanical Garden (NTBG) made numerous attempts to propagate the seeds of H. haplostachya in its nursery. After unsuccessful results, the seeds were scattered in an outdoor planter, near cultivated Nephrolepis cordifolia (fern) and Munroidendron racemosum. The seeds sprouted and the resulting plants are now the source of clonal and seed propagules (M.H. Chapin, pers. comm. 2002).
NTBG currently has ex situ holdings of 900 seeds in its seed bank, which represents the two populations. In addition, there are six plants growing in the nursery, and six plants representing one population growing in the botanical garden.
1. Map genetic diversity in the surviving populations of H. haplostachya.
2. Exclosures are needed around populations of H. haplostachya. Testing the effects of fencing before it is utilized is needed.
3. Conduct pollination biology and seed dispersal studies.
Recommendations derived from M.H. Chapin, M. Maunder, and P. Tummons.
1. Establish secure ex situ stocks with full founder representation.
2. Develop proper horticultural protocols and pest management for H. haplostachya.
3. Survey ex situ holdings and conduct molecular fingerprinting.
Recommendations derived from M.H. Chapin and M. Maunder.
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