Kokee Rare Plant Facility – FY 2007 Report

Objectives

To increase the probability of the rarest Kauai plant species survival by expanding the number of species currently being propagated at the Kokee Nursery. This will increase the genetic diversity of these outplanted species as they are introduced into protected areas within their historic range. Some plant materials may be distributed to cooperator nurseries for scientific study and to maintain representative gene pools of selected species.

Performance

Three full time workers were hired. The native plant propagation and outplantings continued throughout the year by Kauai District personnel. A horticulturalist was hired during the last month of the reporting period. Propagation efforts were done with the assistance of the division’s nurseryman. This project included the propagation of 14 listed endangered species and 6 other rare Kauai species. These species were outplanted. Propagation and hardening of these Hawaiian plant species for outplanting was accomplished at the Kokee Rare Plant Facility. These species included:

Alsinidendron viscosum (42), Caesalpinia kavaiensis (16), Capparis sandwichiana (9), Chamaesyce halemanui (4), Charpentiera densiflora (2), Dubautia latifolia (16), Dubautia sp. nov. (4), Embelia pacifica (13), Euphorbia haeleeleana (5), Hibiscadelphus distans (31), Hibiscus brackenridgei (36), Hibiscus clayi (22), Hibiscus kokio (6), Myrsine linearifolia (118), Peucedanum sandwicense (53), Phyllostegia waimeae (14), Pritchardia hardyi (8), Ranunculus mauiensis (46), Rauvolfia sandwicensis (2), Kokia kauaiensis (14), Sesbania tomentosa (60), Solanum sandwicense (62), Viola chamissoniana (2), Wilkesia hobdyi (197), Xylosma crenatum (5), and Zanthoxylum dipetalum (3).

Hibiscus clayi collected by DOFAW personnel from the Nounou Mountain enclosure provided outplanting stock needed for propagation and planting back into the original site. DOFAW crew did the weeding and the removal of clidemia, guava, and other invasive plant species from the area. The site continues to recover from animal and human disturbance.

Additional Information

  • DOFAW’s Bonamia menziesii and Marattia douglasii exclosure in Kahelunui Valley was weeded and lantana was removed when fence repairs were completed.
  • DOFAW crew maintained, weeded, and outplanted in the Wailua Experiment Station site. Outplanting of Hibiscus clayi and Acacia koa was added to this lowland plant community location.
  • DOFAW crew repaired the fence protecting 22 Isodendrion laurifolium in Kahoaloha Valley. This site is showing the recovery of ferns and the flowering of the Isodendrion. No seeds have been collected.
  • Nounou Mountain exclosure was outplanted with eight Pritchardia hardyi. This exclosure has a mature Munroidendron racemosum and three juvenile Hibiscus clayi. Guava and clidemia weed removal was accomplished.
  • Kaulaula exclosure was maintained and outplanted with 89 Wilkesia hobdyi.
  • Kahoaloha exclosure was outplanted with ten Caesalpinia kavaiensis and two Rauvolfia sandwicensis. Fence and noxious weed control occurred.
  • Kalalau Rim exclosure was outplanted with 42 Alsinidendron viscosum, 14 Phyllostegia waimeae, 2 Dubautia latifolia, and 14 Kokia kauaiensis. The Na Pua Noeau program volunteers assisted in weeding and outplanting.
  • New populations of Euphorbia haeleeleana, Remya kauaiensis, Poa siphonoglossa, Lysimachia kalalauensis, Lobelia yuccoides, and a Dubautia sp. were found in the Kuia Natural Reserve.
  • Solanum sandwicence on Kumuwela Ridge were checked for seed production.
  • Exocarpos luteolus population along Kalalau Rim was checked for seed production.
  • Two RCUH workers assisted in completing maintenance of 14 fenced enclosures throughout the year. Work included fence repair, trail maintenance, outplanting, and weed control.
  • Seed collection of Pteralyxia kauaiensis from Mahanaloa Valley was accomplished from Kuia NAR.
  • Kawaiula Valley populations of Euphorbia haeleeleana, Joinvillea ascendens, Nothocestrum peltatum, Psychotria hobdyi, Remya kauaiensis, and Lysimachia kalalauensis were monitored for seeds.
  • Nothocestrum latifolium was flowering at the Kalalau Rim Exclosure but no fruit was noted.
  • Ranunculus mauiensis seeds were collected from within the Kalalau Rim Exclosure.
  • Along the Nualolo Trail Nothocestrum peltatum, Ranunculus mauiensis, and Xylosma crenatum were monitored for flowers and fruits.