CPC Plant Profile: Kauila
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Plant Profile

Kauila (Colubrina oppositifolia)

Closeup of fruits and leaves. Photo Credit: S. Perlman
Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Endangered
  • Family: Rhamnaceae
  • State: HI
  • Nature Serve ID: 147025
  • Date Inducted in National Collection: 02/10/1987

There is just one endangered Colubrina species that is endemic to Hawaii (U.S. Fish and Wildlife Service [USFWS] 2001). C. oppositifolia has one of the hardest native woods and took the place of metals in the economy of ancient Hawaiians. It was used to make kapa (cloth) beaters, poles, spears and other weapons. C. oppositifolia, a member of the buckthorn family (Rhamnaceae) is a tree that can grow from 5 to 13 meters (16 to 40 ft) tall and has darkly pigmented ovate to ovate-elliptic leaves. They are thin with dull green on the upper surface, and olive green beneath. 10 to 12 flowers are in a branched cluster. They have five green-yellow petals about 1.5 millimeters long. The rounded fruits are brown and slit apart, releasing oblong-obovoid black, shiny, hump-back seeds (6 to 8 mm long) (USFWS 1996). This species is distinguished from other species of this genus by its opposite leaf position, dull leaf surface, and entire leaf margins (Wagner et al. 1999). This endangered species differs from other, more common Colubrina species in Hawai'i because of its growth habit, as well as leaf arrangement (opposite), texture, venation, and margins.

Participating Institutions
Updates
Nature Serve Biotics
  • 05/02/2017

Endemic to the Waianae Mountains of Oahu, West Maui, and Hawaii Island. The total number of individuals is thought to be fewer than 300. Almost no regeneration is occurring throughout its range. Many of the remaining trees are partially dead. Fires have killed many trees on Hawaii Island within the last decade. Alien plants and introduced ungulates also threaten the species and its habitat.

  • 01/01/2010

Threats to C. oppositifolia include the loss of habitat by feral ungulates and invasive introduced plants, such as Pennisetum setaceum (fountain grass), Lantana camara (lantana), and Schinus terebinthifolius (Christmas berry). Fire and the coffee twig bor

  • 01/01/2010

Number of populations: 10 (USFWS 2001) Number of plants: 280-300 (USFWS 2001)

  • 01/01/2010

The National Tropical Botanical Garden (NTBG) has germinated and propagated C. oppositifolia. The Department of Land and Natural Resources, Department of Forestry and Wildlife (DLNR, DOFAW) has also outplanted more than 64 individuals into several exclosures on Puu Waawaa (Hawaii) (USFWS 1996). Seeds of C. oppositifolia have been tested by the Center for Conservation Research and Training (CCRT), finding that they are orthodox and can tolerate freezing and drying. The laboratory germination time was two to three weeks (Yoshinaga 2002). Kwon and Morden (2002) used molecular markers (RAPDs) to examine the genetic structure of the remaining populations of this taxon and compared it relative to other native Hawaiian species. They found relative variation to be lower than with other Hawaiian species, larger populations to contain the highest levels of genetic diversity and smaller populations to generally contain the least.

  • 01/01/2010

A proposal by Ka `Ahahui `O Pu`uwa`awa`a offers a unique opportunity to protect C. oppositifolia and its main remaining habitat at Pu`uwa`awa`a. This organization is composed of residents of Pu`uwa`awa`a and Pu`u Anahulu, ecologists, land managers, and others who care deeply about this special place. Their proposal includes restoration of native ecosystems and cultural practices, public education, hunting, ranching, and ecotourism (Environment Hawaii 2001). NTBG currently has ex situ holdings of 804 seeds in its seed bank, which represents three out of four populations. In addition, there are three plants that represent an unknown population growing in the nursery of the botanical garden. In 2002, the U.S. Fish and Wildlife Service determined that a designation of critical habitat was prudent for this species. (USFWS 2002) This species occurs naturally on a privately-owned site. A cattle fence has been in place here since 1950, and the site has been actively managed since 1996. At this site, management has actively removed the invasive grass, Pennisetum setaceum, thus reducing wildfire risk in the area, and has also actively removed goats, feral hogs, stray cattle, and controlled the rodent population. Additionally, numerous native understory plants have been planted. (USFWS 2002)

  • 01/01/2010

1. Research a control method for the coffee twig borer. 2. The habitat of C. oppositifolia to be protected from ungulates and alien plants. 3. Ensure the populations of C. oppositifolia remain viable on each of the islands that it occurs on. 4. Conduct pollination biology, and seed dispersal studies. 5. Map genetic diversity in the surviving populations of C. oppositifolia. 6. Test the influence of weeding and fencing on populations of C. oppositifolia. Recommendations derived from M.H. Chapin, M. Maunder, and USFWS (1996).

  • 01/01/2010

1. Establish secure ex situ stocks with full founder representation. 2. Develop proper horticultural protocols and pest management for C. oppositifolia. 3. Survey ex situ holdings and conduct molecular finger printing. Recommendations derived from M.H. Chapin and M. Maunder.

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Photos
Nomenclature
Taxon Colubrina oppositifolia
Authority Brongn. ex Mann
Family Rhamnaceae
CPC Number 1033
ITIS 28528
USDA COOP
Common Names kauila | kauwila
Associated Scientific Names Colubrina oppositifolia | Colubrina oppositifolia var. obatae
Distribution C. oppositifolia was historically found on the island of Oahu in the south and central Waianae Mountains, and on the island of Hawaii in the Kohala Mountains and on the slopes of the volcanoes Hualala
State Rank
State State Rank
Hawaii S1
Habitat

C. oppositifolia is found in dry to mesic forest 240 to 920 meters (787 to 3,018 ft) elevation (Wagner et al. 1999). Associated species of C. oppositifolia include Canthium odoratum (alahee), Reynoldsia sandwicensis (ohe) (USFWS 1996).

Ecological Relationships

C. oppositifolia is a hermaphrodite that is insect pollinated (Sakai et al. 1995).

Pollinators
Common Name Name in Text Association Type Source InteractionID

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