Kokee Rare Plant Facility – FY 2006 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

Two Research Corporation University of Hawaii field crewmembers were hired to assist DOFAW Forestry Workers with maintenance of 14 fenced enclosures throughout the year. Work included fence repair, trail maintenance, outplanting, and noxious weed control. Native plant propagation and outplantings continued throughout the year by Kauai District personnel. No horticulturalist was hired during this reporting period. Propagation efforts were done with the assistance of the division’s nurseryman. This project included the propagation of 26 listed endangered species and other rare Kauai species. Propagation and hardening of these Hawaiian plant species for outplanting was accomplished at the Kokee Rare Plant Facility. These species included: Caesalpinia kavaiensis (32), Hibiscadelphus distans (158), Hibiscus clayi (6), Munroidendron racemosum (6), Phyllostegia waimeae (60), Rauvolfia sandwicensis (6), Pteralyxia kauaiensis (12), Sesbania tomentosa (130), Wilkesia hobdyi (121), Melicope paniculata (12), Stenogyne campanulata (13), and Myrsine knudsenii (12).

Hibiscus clayi collected by DOFAW personnel from the Nounou Mountain enclosure provided outplanting stock needed for propagation and planting into the Wailua Experiment Station outplanting site. The Kauai Native Plant Society volunteers assisted in 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 was weeded and lantana removed when fence repairs were completed.
  • DOFAW crew maintained, weeded, and outplanted in the Wailua Experiment Station site. Outplanting of Hibiscus clayi (6) 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 to date.
  • Wiliwili, Erythrina sandwicensis, seed collection from 6 populations was completed due to the infestation of the Erythrina Gall Wasp in an effort to bank seeds for the future.
  • Flueggea neowawraea seeds were collected. Also checked for seeds were Pteralyxia kauaiensis and Rauvolfia sandwicensis.
  • A new population of Poa siphonoglossa, Remya kauaiensis, Lobelia yuccoides, Zanthoxylum dipetalum var. dipetalum, and a Dubautia spp. were found in the Na Pali-Kona Forest Reserve.
  • Located Solanum sandwicence on Kumuwela Ridge and checked for seeds.
  • Exocarpos luteolus population was checked for seed in Kumuwela.
  • Seed collection of Pteralyxia kauaiensis from Mahanaloa Valley.
  • 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 in Kalalau Rim Exclosure but no fruit was noted.
  • Ranunculus mauiensis was found along the Nualolo Trail for the first time.
  • Nothocestrum peltatum and Xylosma crenatum were monitored for flowers and fruits.