The genus Hydnocarpus is currently (2015) under review and there seems no clear and generally accepted treatment currently available. Because different authorities are treating the genus differently, we have included several species here where we are uncertain if we are using the correct name - or even if we are including it more than once under different names. Although its position is currently unresolved, this is one of the species we are more confident about[].

Common Name:

General Information

Hydnocarpus heterophyllus is an evergreen tree usually growing up to 20 metres tall, exceptionally to 36 metres[].
The tree is harvested from the wild for mainly local use as a medicine and possible as a source of wood. The seeds of this genus might be one of the several species that are harvested for commercial use of their seed as a source of chaulmoogri oil (most commonly harvested from Hydnocarpus kurzii).

Known Hazards

Although we have seen no specific information for this species, the seeds of many members of this genus contain cyanogenetic glycosides[, ]. In very small quantities this has been used medicinally, having been shown to stimulate respiration and improve digestion, it is also claimed to be of benefit in the treatment of cancer. In excess, however, it can cause respiratory failure and even death.

Botanical References

Range

Southeast Asia - Indonesia, Philippines

Habitat

Scattered in rain-forest, often on calcareous soil or on limestone rocks; at elevations from 150 - 900 metres[].

Properties

Medicinal Rating
Other Uses Rating
Habit	Evergreen Tree
Height	20.00 m
Pollinators	Insects
Cultivation Status	Wild

Cultivation Details

Species in this genus generally require well-drained sandy or loamy silt soils and grow best along creek beds or on the banks of streams[].
Seeds tend to go rancid rather quickly. Therefore ripe fruits should be opened and the fruit pulp and aril removed from the seeds. Seeds are then washed and dried in the sun. Sun-dried seeds, either whole or broken, are cold-pressed or pressed under concurrent heating to extract the oil. The chemical composition of the end-product of these methods varies[].
A dioecious species, both male and female forms need to be grown if fruit and seed are required

Edible Uses

None known

Medicinal

The seeds contain a fatty substance, which is extracted and used topically as a treatment against skin-diseases[].

Other Uses

The white wood is very hard, but apparently not used[].
When it attains suitable dimensions, the wood of species in this genus is often used locally for house building (poles), temporary heavy construction, posts, fences, interior finishing, panelling and door and window frames[].

Propagation

Seed - best sown as soon as it is ripe, when it will usually germinate quickly. Germination of stored seed can be slow, with some species in the genus taking up to 2 years. Sow the seed in a shaded position in a nursery seedbed and keep moist. Grow on the seedlings in shade until large enough to plant out[].

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