Epicharis parasitica: The Majestic Yellow Mahogany of Tropical Rainforests
The yellow mahogany, scientifically known as Epicharis parasitica, is a striking tree species belonging to the Meliaceae family. Native to the lush tropical rainforests of Taiwan, northeast Queensland, Papuasia, and various regions of Malesia, this tree is a hallmark of biodiversity in its native habitats. From its towering height to its unique flowering habits, the yellow mahogany is as biologically fascinating as it is visually impressive.
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Key Facts
- Common Name: Yellow mahogany.
- Scientific Name: Epicharis parasitica.
- Conservation Status: Least Concern (NCA).
- Maximum Height: Up to 36 meters (118 feet).
- Native Range: Taiwan, Philippines, Borneo, Sumatra, Java, Sulawesi, Maluku, East Timor, New Guinea, Bismarck Archipelago, Solomon Islands, and Queensland.
- Unique Feature: Exhibits both cauliflory and ramiflory.
Botanical Description
The yellow mahogany is a substantial tree, reaching heights of up to 36 meters with a trunk diameter that can extend to 60 centimeters. In some environments, the tree develops buttresses—wide, flaring ridges at the base of the trunk—that can grow up to 1.5 meters in height and width. Its bark varies from yellowish to grey-brown and ranges in texture from smooth to flaky, featuring scattered lenticels (small pores used for gas exchange).
Foliage and Structure
The tree features compound leaves arranged spirally on the twigs. These leaves can reach lengths of 1.5 meters and typically consist of up to 19 leaflets. Each leaflet is oblong to ovate, measuring up to 19 centimeters long and 6 centimeters wide, with approximately 14 lateral veins on each side of the midrib.
Flowers and Fruiting
One of the most distinctive characteristics of Epicharis parasitica is its method of flowering. The tree exhibits cauliflory (flowers growing directly from the trunk) and ramiflory (flowers growing from woody branches). The inflorescence is a raceme up to 30 centimeters long, producing sweetly scented white or cream flowers with four petals and a white staminal tube measuring roughly 15 mm by 4 mm.
The fruit is a red-brown, globose capsule approximately 4 to 5 centimeters in diameter. Each capsule contains up to four segments, with one seed per segment. These brownish-black seeds, about 2 centimeters long, are encased in an orange-red sarcotesta (a fleshy seed coat).
Taxonomy and Etymology
The taxonomic history of the yellow mahogany is complex. It was first described in 1757 by Swedish naturalist Pehr Osbeck as Melia parasitica. Over the following centuries, it was described more than 40 times under various names. In 1966, Indonesian botanist André Joseph Guillaume Henri Kostermans transferred the species to the genus Dysoxylum. In Australia, populations were specifically referred to as Dysoxylum schiffneri before the current classification as Epicharis parasitica was established.
The species name parasitica is derived from the Latin word for "parasitic." This is a remnant of Osbeck's early, mistaken belief that the flowers were parasitic organisms rather than part of the tree itself.
Distribution, Habitat, and Ecology
The yellow mahogany thrives in well-developed rainforests, including those situated on limestone, at altitudes ranging from sea level up to 2,100 meters. Its wide distribution spans across Southeast Asia and the Pacific, from Taiwan and the Philippines down to the Solomon Islands and Queensland.
Ecologically, the tree relies on a variety of pollinators. Butterflies are primary pollinators for the Meliaceae family, but the yellow mahogany also benefits from possums and bats, which climb the trunk to forage and inadvertently assist in pollination.
Cultivation and Use
Due to its aesthetic appeal, Epicharis parasitica has potential as a feature tree in parks or gardens located in tropical or subtropical climates. For successful cultivation, the tree prefers acid soils with excellent drainage and thrives in part-shade or dappled sunlight. Propagation is typically achieved using fresh seeds.
| Feature | Details |
|---|---|
| Max Height | 36 m (118 ft) |
| Trunk Diameter | Up to 60 cm (24 in) |
| Flower Color | White or Cream |
| Fruit Type | Red-brown globose capsule |
| Soil Preference | Acidic, well-drained |
| Pollinators | Butterflies, bats, and possums |
Frequently Asked Questions
Is the yellow mahogany the same as the langsat or lanzones?
No. While it is sometimes erroneously identified as Lansium parasiticum, the langsat or lanzones is actually Lansium domesticum.
What does "cauliflory" mean in relation to this tree?
Cauliflory is the botanical phenomenon where flowers and fruit grow directly from the main trunk of the tree rather than from new growth or small stems.
Why is the tree called "parasitica"?
The name comes from the Latin word for parasitic, based on an early mistake by naturalist Pehr Osbeck, who believed the flowers were parasitic.
Where can the yellow mahogany be found in the wild?
It is native to tropical rainforests in Taiwan, the Philippines, Borneo, Sumatra, Java, Sulawesi, Maluku, East Timor, New Guinea, the Bismarck Archipelago, the Solomon Islands, and northeast Queensland.
How is the yellow mahogany propagated?
The species can be propagated using fresh seeds.