Part of our mission at Hawaii Tropical Botanical Garden is to educate our visitors about the endangerment of the world’s rainforests and to acquire, preserve and propagate as many rare and endangered tropical plant species as possible to help ensure their survival for future generations
The Garden’s Founders, Dan and Pauline Lutkenhouse, have always been deeply concerned about the rapid destruction of our world’s rainforests and tropical plants, and with good reason. Nearly half of the world’s species of plants, animals and microorganisms live in the rainforest and are facing extinction due to unchecked deforestation. In fact, twenty percent of the original rainforest is already gone and with it countless species have already been lost.
People have relied on tropical plants from the rainforest for building materials, medicinal purposes, nourishment and to beautify our living spaces. Today we also know that our rainforests slow global warming by storing massive amounts of carbon.
The high level of genetic variation or biodiversity that is being lost is essential for species adaptability and continued species evolution. The danger of this loss to the health of our entire planet and all living things cannot be overstated.
Here we will focus on just one small but valuable part of the rainforest that is being lost, the palm tree. Palms are trees in the family Arecaceae, sometimes referred to as Palmae. Palms are widely distributed in the tropical regions of the world, with some species venturing into subtropical or even temperate zones. The Palm Family has over 200 genera and 2,800 species.
Throughout our history, palms have been a most useful resource. Leaves are used for thatching both the roofs and walls of houses. Leaflets are used for weaving mats, hats, baskets and other useful items. The stems of climbing palms such as Calamus, commonly called Rattan Cane, are used for furniture. Palm sugar, palm wine, palm hearts and various fruits from a number of palms such as Date Palms and Coconut Palms provide us with food. Carnauba wax, used in automobile and furniture polishes, is produced from the leaves of the Copernicia prunifera palm.
During its thirty years in existence, the Garden has endeavored to protect, propagate and display endangered palms for their unique beauty and to educate the public about their plight.
One such palm is the unique Pelagodoxa henryana, commonly refered to as the Marquesas Palm. It has large, entire leaves up to 6.5 feet long and 3 feet wide and its trunk can reach over 20 feet high. It is native to the Marquesas where it is found in dense rainforest, growing in narrow ravines in humid valleys at low altitudes. The ravine along our Boardwalk entry to the Garden matches these conditions exactly and you can see it is thriving there today.
We hope to see its first inflorescence soon which should bear unisexual flowers of both sexes, and can produce fertile seed. This palm is now nearly extinct in the wild, with only one known population growing in a valley on Nuku Hiva, one of the Marquesas Islands in French Polynesia.
Another endangered palm is Carpoxylon macrospermum, a monotypic genus endemic to Vanuatu, a South Pacific island chain. It was first described as Carpoxylon in 1875 from a specimen collected on the Vanuatuan island of Aneityum in 1859. Later attempts to find it on Aneityum failed. Thus, it was thought to be extinct until its accidental “rediscovery” on the Vanuatuan island of Santo in 1987 by Australian botanist John Dowe.
Since then, concerned conservationists in Vanuatu had the brilliant idea to market seeds of Carpoxylon and other palms worldwide to raise money to fund conservation activities. Thus, the species has made a comeback in cultivation but is still critically endangered in the wild. HTBG acquired and planted its first specimen in 1995 and it has reached a height of over 20 feet. Because of its rarity it was planted in a hidden area, but today a more recently planted specimen can be seen near the end of the Boardwalk.
Carpoxylon macrospermum can grow up to 90 feet tall and its crownshaft is an amazing 4 to 5 feet tall! The leaves are 12 feet long with leaflets 8 inches to 4 feet long.
Pictured to the left is Oncosperma tigillarium, commonly called Nibong Palm.
Native to South-East Asia, this clumping palm is covered in rings of downward-pointing black spines on the younger parts of the trunk.
Found in swampy areas near the coast, the Nibong can reach over 80 feet tall with a diameter of 6 inches. The trunks are salt tolerant and the wood is used for house construction.
Our Garden sits on the ocean and has several specimens thriving in our collection.
Metroxylon amicarum, commonly called Caroline Ivory-nut Palm, is a beautiful palm endemic to the Caroline Islands in Micronesia.
This solitary palm grows up to 80 feet tall with spiny leaves. The chestnut-brown, apple shaped fruit has a white ivory-like inside that can be polished and carved into decorative items and jewelry.
Dan Lutkenhouse planted 3 of these palms at the bottom of the Boardwalk Trail about 14 years ago. Today, you can not miss these 40 foot palms towering over the patch of Temple Flowers below them.
Hydriastele rheophytica is a recently discovered palm which grows on the banks of rivers in New Guinea. The name is derived from the Greek hydor meaning water and rheophytes which means growing in or near a stream.
This small, attractive palm grows up to 10 feet tall and has adapted to survive flood conditions by having very flexible stems and finely pinnate leaves which present very little resistance to water flow and let the palm bend with the water rather than breaking.
This palm is planted in the Kahali’i stream-bed along the Boardwalk.
These palms are just a sample of the many rare and endangered tropical plants the Garden has striven to save and propagate over the years.
Unfortunately the destruction of rainforest habitat continues. If we are to stem the tide of this devastation, then each of us must behave in an ecologically aware and responsible manner. There are some simple things we can all do.
One is to recycle our aluminium cans. This will reduce the need for bauxite, the source of aluminium, which must be mined from the ground in tropical countries.
Also we can use the power of the purse to lessen the demand for unsustainable goods and destructive practices. For instance, when purchasing tropical woods for furniture or construction, choose products that have been grown in a sustainable manner, or better yet, use recycled materials.
Finally and most importantly, you can share in the Garden’s mission! Help us spread awareness of rainforest degradation and how each of us can help.