Pahole Rare Plant Facility – FY 2008 Report
The objectives of the Pahole Rare Plant Facility (PRPF) are listed below. Priorities will shift as propagation material is available and as plants are reintroduced, but should follow the order given here.
- Provide facilities for the ex situ cultivation/storage of mid-elevation species (priority to species with less than 50 individuals in the wild) that cannot be stored as seed or in tissue culture.
- Propagation of rare plants for reintroduction from Oahu as needed for land managers with protected habitats.
- Production of more common native species for restoration efforts, provided time and resources are available and the operation is self-supporting.
PRPF grew 2966 plants representing 60 different listed species in FY 2008. PRPF also provided 149 plants representing 9 listed species for the 2008 outplant season. These plants were used in restoration projects for Oahu Plant Extinction Prevention (OPEP) program, Natural Area Reserve System (NARS), and Army Environmental.
In FY 2008 PRPF completed the building of a 2500 square foot greenhouse which is to be used by one of PRPF’s cooperators, US Army Environmental Program. The completion of this project came about with many hours of work by the Natural Area Reserve (NAR) Project Specialist, Staff from Army Environmental, and PRPF Horticulturist. A project related to the building of this new greenhouse was water supply line, accomplished with volunteer help with the Ala Moana Rotary Club and students from Hawaii Baptist Academy.
Projects accomplished prior to the greenhouse included the installation of 200 feet of underground drainage piping, 20 feet of conduit under a proposed driveway for future irrigation piping and wiring, and underground installation of 120 feet of piping for the water catchment and pumping systems. Also, a 9000-gallon water tank was built for PRPF. This new tank replaces an aging and leaking 2500-gallon polyethylene tank. Through all this construction, drainage and grading work PRPF used 60 tons of aggregate to accomplish these projects in FY 2008.
Provide facilities for the ex situ cultivation of Plant Extinction Prevention Program mid-elevation species (less than 50 individuals in the wild) that cannot be stored as seed or in tissue culture, with priority to Oahu species.
The ongoing project of building a new 2500 square foot greenhouse at PRPF progressed through FY 2008 and has been completed. The horticultural staff of Army Environmental began to use of this new greenhouse in the third quarter of FY 2008. Projects related to the completion of the greenhouse that were done in FY 2008 included installation of a water line into the greenhouse, drainage of adjacent land areas, building of a new water tank, and the installation of piping to accomplish catchment and pumping of water.
Water was connected from the pump station of the main building into the greenhouse in February 2008. This was done utilizing volunteer help on a work day with the Ala Moana Rotary Club and students from Hawaii Baptist Academy. On this work day PRPF’s volunteers did painting, weeding, general cleanup, watering, and water pipe installation at PRPF.
Drainage work was done around the new greenhouse and adjacent areas on the east end of the main building. This work included trenching and installation of 200 feet of drainage pipe. Also 20 feet of underground conduit was installed across a planned driveway. This conduit is for future irrigation piping and wiring needs. Transfer of water from two gutter lines on the roofline of the main buildings to the new water tank was accomplished by underground installation of 120 feet of PVC pipe. This work was done by NARS Field Project Specialist, PRPF Horticulturist, and staff from Army Environmental. Late in FY 2008 a 9000-gallon water tank was constructed by C and C Waterworks. This new tank will replace an aging 2500-gallon polyethylene tank. This new tank was not put into use by the end of FY 2008 but will be done very early in FY 2009.
As Army Environmental has vacated the older greenhouse at PRPF the State has been able to consolidate its plants in sections of this greenhouse to allow for the renovation and rebuilding of this older greenhouse. This project will go on through FY 2009.
A general cleanup of the PRPF site was undertaken in FY 2008. This included the removal of weedy species from the whole site, herbicide work, and the removal of 30 cubic yards of demolition and construction debris. This work was done by the NARS Field Project Specialist and field staff. The PRPF site has shown great improvement because of all this work.
Propagation of rare plants for reintroduction from Oahu as needed for land managers with protected habitats.
A total of 2,969 plants were grown at PRPF during FY 2008 for restoration and living collections. The species included: Abutilon menziesii 15, Alectryon micrococcus var. micrococcus 3, Bobea sandwichensis 1, Bonamia menziesii 6, Caesalpinia kavaiensis 33, Chamaesyce deppeana 7, Chamaesyce herbstii 47, Colubrina oppositifolia 172, Cyanea grimesiana subsp. obatae 131, Cyanea longiflora 24,Cyanea pinnatifida 9, Cyanea superba subsp. superba 136, Cyanea truncate 5, Cyrtandra dentata 7, Cyrtandra polyantha 21, Cyrtandra subumbellata 12, Delissea subcordata 131, Dubautia herbstobatae 43, Eugenia koolauensis 19, Euphorbia haeleeleana 14, Eurya sanwicensis 1, Flueggea neowawraea 87, Gardenia brighamii 22, Gardenia mannii 4, Gouania vitifolia 124, Hedyotis degeneri var. degeneri 18, Hedyotis parvula 5, Hespermannia arbuscula 35, Hibiscus brackenridgei subsp. mokuleianus 3, Isodendron longifolium 6, Kokia drynariodes 4, Labordia cyrtandrae 40, Lepidium arbuscula 5, Lobelia monostachya 2, Lysimachia filifolia 25, Melanthera tenuifolia 152, Melicope christophersenii 1, Melicope lydgatei 2, Neraudia angulata 233, Nototrichium humile 122, Peucedanum sandwicense 1, Phylllostegia hirsuta 25, Phyllostegia kaalaensis 148, Phyllostegia parviflora var. lydgatei 23, Plantago princeps var. princeps 30, Pritchardia kaalae 142, Pritchardia remota 29, Scaevaola coriacea 5, Schiedea adamantis 54, Schiedea kaalae 110, Schiedea nuttallii 152, Schiedea obovata 277, Schiedea trinervis 7, Silene lanceolata 18, Silene perlmanii 20, Solanum sandwicense 1, Stenogyne kaalae subsp. sherffii 50, Tetramolopium filliforme 23, Urera kaalae 12, Viola chamissoniana subsp. chamissoniana 116.
Sixty-one plants from four PEP species were propagated and grown for the Oahu Plant Extinction Prevention (OPEP) Program 2008 outplant season. OPEP provided PRPF with seed and cuttings of a variety of native commons. These were grown and provided to OPEP for outplanting in FY 2008.
Sixty-five plants of three listed species were propagated and grown for outplanting by the Army Environmental Program in FY 2008. Also, Army Environmental provided PRPF with seeds of a number of common natives from the Pahole area. These were grown and provided to them for habitat restoration in and around the snail enclosure located in the Pahole NAR.
An outplant project in FY 2008 brought together the cooperative efforts of a number of state agencies. This was the outplanting of 20 Colubrina oppositifolia and 3 Caesalpinia kavaiensis on fenced NAR land. Participation in this project came from DOFAW Administration Staff, NARS Field Staff, Koolau Watershed Partnership Staff, Lyon Arboretum Micropropagation Staff, OPEP Staff, an Americorp Intern, and PRPF Horticulturist. This was a very successful outplanting and the planting is doing very well.
Production of more common native species for restoration efforts, provided time and resources are available and the operation is self-supporting. The staff is currently growing numerous seedlings and cuttings of native commons. Seeds and cutting material were collected by OPEP and NARS Staff. These plants will be used in their habitat restoration efforts.