From Common Forest Trees of Hawaii

Rainbow Eucalyptus
Eucalyptus deglupta
Eucalyptus-Like family (Myrtaceae)

Post-Cook introduction

The beautiful mottled bark of many colors distinguishes this tree and qualifies it as an ornamental for moist regions. It is, however, a rapidly growing tree that reaches enormous size and so must be used with caution as a garden or landscaping tree. The smoothish bark peels in long strips, exposing various shades of pink, purple, copper, brown, orange, and green. Further identified by the broad mostly paired leaves and the numerous small flowers and small half-round Because of its very rapid growth and good wood, this tree is now used in low elevation forest plantations.

©2005 Forest And Kim Starr
Where native, a large tree 50–200 ft (15–61 ) high, with straight clear trunk up to 8 ft (2.4 ) in diameter and with open In Hawaii, to 150 ft (45 ) in moist wind-sheltered bottom land, its preferred site. One of the few eucalypts that occurs naturally in pure stands, this tree does well in plantations. Bark smoothish, thin, of many colors. Twigs slightly four-angled.

Leaves mostly with leaf-stalks of 1⁄2 inch (13 ). Blades are 2–6 inches (5–15 ) long and 1–2 3⁄4 inches (2.5–7 ) wide, long-pointed at rounded or blunt at base, slightly thickened, shiny green, dull and paler beneath, side veins fine and curved. Juvenile leaves stalked, to oblong lance-shaped, 2 inches (5 ) long and 1 1⁄2 inches (4 ) wide, long-pointed, thin.

Flower clusters () and lateral, with flattened branches 2–4 inches (5–10 ) long. Flowers numerous, 3–7 in a group () on slender stalks less than 1⁄4 inch (6 ) long, more than 1⁄2 inch (13 ) across the many spreading white Buds club-shaped, 3⁄16 inch (5 ) long and 1⁄8 inch (3 ) wide, with a conical base and conical pointed lid of equal length. Seed capsules are short-stalked, half-round, 3⁄16 inch (5 ) long and broad, dark brown with thin and 3–4 pointed valves 1⁄16 inch (1.5 ) long, protruding and spreading.

Wood from trees up to 20 years old is pale reddish brown with density, appearance and working characteristics similar to red lauan (Shorea negrosensis Foxworthy) of the Philippines. Wood from older trees is said to be more dense, but the lightweight wood ( gr. 0.45) from young trees in Hawaii has a relatively low shrinkage and no serious growth stress problems in manufacturing. It is suited for a wide range of uses in furniture and construction.

Used elsewhere for construction, cabinet work, and boat building.

This species was introduced to Hawaii at Wahiawa Botanic Garden in 1929 from the Philippines. Only 4,000 trees had been planted in the forest reserves before 1960, but since then E. deglupta has been used extensively, and several New Guinea and New Britain races have been introduced. Trees may be seen also at the Hilo State Office Building (where they had to be topped for safety 3 or 4 years after planting), next to Hamilton Library on the University of Hawaii campus, and at numerous other locations. The bark makes the tree easily recognizable.

Special areas
Keahua, Wahiawa, Foster, Waiakea

Height 86 ft (26.2 ), c.b.h. 6.5 ft (2.0 ), spread 42 ft (12.8 ). Wahiawa Botanical Garden, Wahiawa, Oahu (1968).

Philippine Islands (Mindanao), Moluccas, New Guinea, and New Britain. Wet lowland tropics or tropical rain forests.

Other common names
Mindanao-gum, NewGuinea-gum, amammanit eucalyptus; kamarere (Papua-New Guinea)

Eucalyptus naudiniana F. Muell.

This species ranges from New Britain northwestward through Indonesia to Mindanao in the Philippines. It achieves its best growth in pure stands that grow on flood plains along the rivers of New Britain. It is one of only two eucalypts (E. urophylla S. T. Blake is the other) not native to Australia and one of the few native to a tropical rainforest climate.

One of the world’s fastest growing trees, reaching as much as 33 ft (10 ) in less than 18 months. In Hawaii, attaining a height of 100 ft (30 ) in 7 years. A planted stand near Port Moresby, New Guinea, had an average height of 180 ft (54 ) and diameter of 2 ft (0.6 ) at 14 years of age.

stamen -- the pollen-producing reproductive organ of a flower; The stamen consists of an anther supported by a filament.

An umbel is a collection of flowers on short stalks which spread from a common point, somewhat like umbrella ribs.

synonym -- In botany a synonym is a species name that at one time was thought to be the correct name for a plant but was later found to be incorrect and has been replaced by a new name.

cm -- A centimeter which is about 0.4 inches.

In an opposite leaf arrangement the leaves come in pairs with one leaf on each side of a stem.

mm -- millimeter. About 1/25th of an inch.

sp. -- The abbreviation for "species". The plural is "spp". When used it sometimes means that the exact species is unknown. For example, "Aster sp" would mean some species within the Aster genus but the writer may not know exactly which species.

ovate -- Oval, egg-shaped, with a tapering point.

m -- A meter is about 10% larger than a yard.

terminal -- Located at the end (the tip or the apex).

The apex is the tip or the furthest point from the attachment.

fruit -- any seed-bearing structure in flowering plants. It is formed from the ovary after flowering.

A panicle is a much-branched inflorescence. The bottom flowers in a panicle open first.

canopy -- The foliage of a tree; the crown. Also the upper layer of a forest.

disc flowers are those in the center of a sunflower or daisy. Not a ray flower.