Koa
Koa,
Acacia koa Gray, is Hawai'i's most prized tree species. The koa
is a large, evergreen broadleaf tree and the only Acacia endemic to Hawai'i.
It is found from 600 to 7,000 feet on all of the main islands except Ni'ihau
and Kaho'olawe. Koa occurs in both pure and mixed forest stands and
is frequently found growing with the native 'ohi'a
(Metrosideros polymorpha).
These small koa trees where found along side the road on Koloko Drive on the slopes above Kailua-Kona. Larger koa trees can be seen at Hawai'i Volcanoes National Park.
Koa
are large trees up to 100 feet tall and spreading 40-80 feet. On mature trees,
what appear to be sickle-shaped leaves are actually modified leaf stalks called
phyllodes, which allow more effective drought resistance.True leaves, which
facilitate rapid growth, are similar to those of koa-haole or mimosa
and generally occur during the seedling state. Old trees usually bear only
laurel green phyllodes, but sometimes true leaves appear on the trunk or lower
branches, or after wounding. Flowers appear as small pale yellow "puffballs."
No discussion of the koa tree would be complete without mentioning its importance to the Hawaiian rain forest. It is a nitrogen-fixing species. In dense, pole-size stands, nitrogen-rich koa foliage can account for 50 to 75 percent of the leaf-litter. Mature koa is needed for bird habitat; our forest birds do not use young, pure stands of koa, but do use the old, mixed-species stands adjacent to young stands.
The
koa's fine straight trunk made the wood a favorite for canoes in ancient
times. Hawaiians also used the wood for surfboards, storage containers (but
never for food storage), weapons, and tools.
Today, this lustrous wood is used for cabinets, veneer, and crafts. It frequently occurs with a curly grain and ranges in color from golden-blonde through most common orange-red to deep purples.
The interior walls of Hulihe'e Palace were originally koa.The doors are made of koa and much of the Palace furniture was crafted from koa.
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