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Hymenaea courbaril (PROSEA)

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Plant Resources of South-East Asia
Introduction
List of species


Hymenaea courbaril L.


Protologue: Sp. pl.: 1192 (1753).
Family: Leguminosae
Chromosome number: 2n= 24

Synonyms

Hymenaea candolleana Kunth (1823), Hymenaea retusa Willd. ex Hayne (1830), Inga megacarpa M.E.Jones (1929).

Vernacular names

  • West Indian locust, jatoba, courbaril (En)
  • Indonesia: kobari, locus (general)
  • Philippines: jatoba.

Origin and geographic distribution

H. courbaril is native to the American tropics and is distributed in the West Indies, and in Central and South America from southern Mexico to Brazil. It is cultivated in the tropics, was introduced into Singapore in 1875 and is now found in Malesia, particularly in Peninsular Malaysia, Sabah and Java.

Uses

All parts of H. courbaril contain a resin, but it is generally only tapped from the bark. The resin is used in special grades of varnishes, lacquers, paints, inks, plastics, sizing, adhesives, fireworks, and crockery cements. It is used to a lesser extent as incense and for medicinal purposes and for patent leather. Commercially the resin is known as "South American copal". In Brazil, it is the main source of the resin known as "jatoba", "jutaicica", "jutai" or "jutai-acu".


The wood of H. courbaril is valuable and resembles mahogany ( Swietenia Jacq.). It is hard and strong and used for construction, door and window frames, ship building, furniture, panelling and parquet flooring. The mealy pulp around the seeds is sometimes eaten by children, but it has an unpleasant smell. In Brazil, the fruit pulp is also used as a carbohydrate source in making alcoholic beverages for domestic consumption. The bark is a source of tannin and is so thick that it has been used by Indians to make canoes. In agroforestry it is employed as a nitrogen-fixing tree to rehabilitate degraded and marginal soils. It has also been planted as an ornamental tree, but its hard, heavy and malodorous fruits make it less suitable for this purpose. The flowers are attractive to bees and are used for honey production.

Production and international trade

Brazil is the main source of the resin but international trade is believed to be very small or negligible. From 1976 to 1986 production in Brazil declined from 38 t to 23 t and the unit price also declined. No production data are available from South-East Asia. "Recent copal", obtained by tapping, is sent to India and China, where it is manufactured into a coarse varnish.

Properties

South American copal varies in colour from an almost colourless transparent mass to bright yellow-brown. It usually has a dull, rough outer surface where it has suffered oxidation. The resin contains a relatively large amount of tannin. It also contains about 13% copalic acid, a cyclic diterpene. The quality and hardness of the resin are likely to increase with age. It is probably inferior to "East African copal" ( Hymenaea verrucosa Gaertn., Copaifera spp.) and "East Indian copal" ( Agathis borneensis Warb.).

The heavy heartwood is red-brown, streaked, with a density of 730 kg/m3at 15% moisture content for an Indonesian sample, and 880-1000 kg/m3for South-American samples. The wood hardly shrinks or warps. It is very hard, very strong and very tough. It is difficult to work, but planes, turns and polishes well.

Description

An evergreen, medium-sized tree up to 25(-40) m tall, bole 1 m or more in diameter, often much smaller in cultivation; bark smooth, becoming 2.5 cm or more thick, grey to pinkish-brown. Leaves alternate, bifoliolate, glossy green above, gland-dotted; petiole 1-2 cm long, petiolules twisted, 2-4 mm long; leaflet blade falcate, rarely oblong or obovate, 4-10 cm × 2-5 cm, coriaceous, base asymmetrical and rounded, margin entire, apex short to long acuminate. Inflorescence terminal, densely corymbose-paniculate, 8-15 cm long and wide; pedicel 6 mm long. Flowers large, buds up to 3.5 cm long, open flower 3 cm in diameter, all parts glandular punctate; calyx campanulate, 4-merous, grey-green, tube (hypanthium) 6 mm long, lobes ovate to elliptical, 15-18 mm × 8 mm, imbricate, coriaceous, pubescent outside, sericeous inside; petals 5, subequal, oblong, ovate or obovate, equalling the calyx lobes or slightly longer, not clawed, yellow, streaked with red; stamens 10, 3.5 cm long, free, filaments white, folded in bud, anthers red, dorsifixed; pistil with stipitate ovary, stipe 4-8 mm long, ovary with about 15 ovules, style slender, curved about 2.5 cm long. Fruit a compressed cylindrical pod, 8-20 cm × 4-8 cm, smooth or rough but not rugose, dark brown, indehiscent and often remaining for a long time on the tree, usually with 6-12 seeds embedded in pale yellow, unpleasant smelling fruit flesh. Seed flattened ellipsoidal, 2-3 cm long, dark red. Seedling with epigeal germination.

Growth and development

H. courbaril develops according to the architectural model of Troll which is characterized by all axes being plagiotropic and is built by continuous superposition of branches thus forming a sympodial stem. Planted seedlings lack a leading shoot; they branch heavily, but will eventually form a clear bole. Young trees have a taproot, but later the root system spreads shallowly. In the Philippines, large nodules with a rough surface have been observed on the roots. In plantation trials in Peninsular Malaysia, trees attained 14 m height and 19 cm diameter in 8 years in the open. In trials in Java on fertile soil, H. courbaril had attained an average height of 20 m and an average diameter of 19-22 cm 10 years after planting. On moderately fertile soils trees also grow well. Fruiting is almost annual. In Singapore flowering starts in June and fruits need 10-11 months to ripen. In East Java H. courbaril flowers in November-April and ripe fruits are found in July-September. There are 280-300 dry seeds/kg as determined from trees grown in Indonesia; in India 800-900 dry seeds/kg have been counted. Dispersal of the seeds in Costa Rica is by agoutis ( Dasyprocta punctata ), a kind of rodent.

Other botanical information

Within H. courbaril 6 varieties have been distinguished, of which 5 occur only in Brazil. Var. courbaril (described here) has a wide distribution in the American tropics and is also cultivated in the tropics of Africa and Asia, including South-East Asia.

H. verrucosa Gaertn. (synonym: Trachylobium verrucosum (Gaertn.) Oliv.) is a resin-producing species from tropical Africa which is also cultivated pantropically. Major differences with H. courbaril are: inflorescence up to 35 cm long, flowers small, buds less than 15 mm long, petals distinctly clawed, pod surface verrucose-rugose. See also the chapter on minor species.

Ecology

H. courbaril is a light-demanding species and in South America it is found in secondary forest on sandy, well-drained soils. It mainly occurs in dry forests at low altitudes, although it can grow well at higher elevations.

Propagation and planting

Seed of H. courbaril can be stored for a long time without losing viability but should be scarified before sowing either by filing the seed coat, or by treatment with hot water or with concentrated sulphuric acid. In an experiment in India 70-80% germination was obtained after treatment with hot water or with concentrated sulphuric acid for 5-25 minutes whereas untreated seed did not germinate. In Costa Rica, seeds germinate well under natural conditions at temperatures above 23°C and in humid soil. Stripped seedlings or stumps can be used as planting stock giving a satisfactory survival, whereas direct seeding has also been used.

Planting trials on degraded land in West Java (Indonesia) were not very successful, with only 9% survival after 2 years in one site and 68% survival after 8 months in another. On fertile soil, trials were more successful. A spacing of 3 m × 2 m was applied, but because of the heavy branching 3 m × 1 m has been recommended.

Management H. courbaril has never been planted for its resin. For timber production the young trees need strong lateral competition because of the weak apical dominance. Even large branches are readily shed.


Diseases and pests

No particular diseases or pests have been observed in H. courbaril in South-East Asia. In South America several pathogens have been identified, but their importance is probably minor.

Harvesting

In South America trees of H. courbaril used to be tapped. The fresh resin obtained by tapping the trees ("recent copal") is much softer than that dug up from the ground ("fossil copal"). It has the nature of a balsam or soft elemi and is also used medicinally. The pale yellow or reddish resin exudes from the bark and trickles to the ground where it hardens into lumps and eventually become covered with soil. In the course of time considerable quantities of resin collect in this way.

Yield

Native collectors in South America can obtain a barrel full of resin of H. courbaril by digging around the roots of a tree, and several barrels from the former site of a large tree that has long since decayed. In a 60-year-old trial plantation in Peninsular Malaysia a mean annual volume increment of 3.7 m3/ha was obtained and 3 m3/ha was produced in East Java by an 11-year-old trial plantation.

Handling after harvest

The resin of H. courbaril is not processed further and is used directly for the manufacture of varnishes and lacquers.

Genetic resources and breeding

There are no known germplasm collections or breeding programmes for H. courbaril . It is not threatened by extinction.

Prospects

H. courbaril is more important for timber production than for its resin; its fairly fast growth and good wood quality may hold promise for the future. The prospects for the resin market, however, are not promising.

Literature

  • Appanah, S. & Weinland, G., 1993. Planting quality timber trees in Peninsular Malaysia - a review. Malayan Forest Record No 38. Forest Research Institute Malaysia, Kepong, Malaysia. 221 pp.
  • Brahmam, M., 1996. Effect of pre-sowing treatments for hastening the germination of Enterolobium cyclocarpum (Jacq.) Griseb. and Hymenaea courbaril L. Indian Forester 122(8): 740-745.
  • Coppen, J.J.W., Gordon, A. & Green, C.L., 1994. The developmental potential of selected Amazonian non-wood forest products: an appraisal of opportunities and constraints. Paper presented at FAO Expert Consultation Meeting, 4-8 July, Santiago, Chile.
  • Ding Hou, Larsen, K. & Larsen, S.S., 1996. Caesalpiniaceae (Leguminosae-Caesalpinioideae), Hymenaea. In: Kalkman, C., Kurkop, D.W., Nooteboom, H.P., Stevens, P.F & de Wilde, W.J.J.O. (Editors): Flora Malesiana, Series 1, Vol. 12. Rijksherbarium/Hortus Botanicus, Leiden University, Leiden, the Netherlands. pp. 724-725.
  • Howes, F.N., 1949. Vegetable gums and resins. Chronica Botanica Company, Waltham, Massachusetts, United States. pp. 98-99.
  • Japing, H.W. & Oey Djoen Seng, 1936. Cultuurproeven met wildhoutsoorten in Gadoengan - met overzicht van de literatuur betreffende deze soorten [Trial plantations of non-teak wood species in Gadungan (East Java) - with survey of literature about these species]. Korte Mededeelingen No 55, part 1 to 6. Boschbouwproefstation, Buitenzorg, Dutch East Indies. pp. 159-163.
  • Lange, W., 1996. Natürliche Baumharze - terpenoide Harze mit geringen Anteilen an etherischen Ölen. Laubholzharze - 3. Mitteilung: Dammar, Cativobalsam und Kopale [Natural tree resins - terpenoid resins with a low content of essential oils. Hardwood resins. Third communication: damar, cativo balsam and copals]. Holz-Zentralblatt 122(72): 1172, 1174.
  • Mors, W.B. & Rizzini, C.T., 1966. Useful plants of Brazil. Holden-Day, San Francisco, United States / London, United Kingdom. pp. 42-48.
  • Widiarti, A. & Alrasjid, H., 1987. Penanaman introduksi jenis pohon kayu bakar di lahan kritis Paseh dan Kadipaten [Introduction of fuelwood tree species on degraded lands in Paseh and Kadipaten areas]. Buletin Penelitian Hutan 488: 1-17.

Authors

N.O. Aguilar