Eucalyptus urophylla (PROSEA)

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Plant Resources of South-East Asia
Introduction
List of species


Eucalyptus urophylla S.T. Blake

Protologue: Austrobaileya 1(1): 7 (1977).

Synonyms

  • Eucalyptus alba auct. non Reinw. ex Blume,
  • Eucalyptus decaisneana auct. non Blume.

Vernacular names

  • Timor white gum (En)
  • Indonesia: ampupu (Timor)
  • Vietnam: bạch dàn dỏ.

Distribution

The Lesser Sunda Islands (Timor, Wetar, Flores, Adonara, Lomblem and Alor). Planted in many tropical parts of the world.

Uses

E. urophylla is an important source of heavy eucalypt timber. The wood is also used for pulp production, as a fuelwood and for charcoal production. The bark has a tannin content of over 10%.

Observations

  • A medium-sized to very large tree of up to 55 m tall, bole straight, up to 200 cm in diameter, bark rough, fissured, scaly-fibrous, reddish-brown or pearl-grey.
  • Juvenile leaves subopposite, ovate or elliptical, adult leaves alternate, straight to slightly falcate, narrowly to very narrowly ovate, 7-20 cm × 0.7-3 cm, caudate-acuminate, discolorous, petiole 12-30 mm long.
  • Inflorescence axillary, simple, umbels 5-8-flowered.
  • Flower buds ellipsoid or obovoid, shortly acuminate, operculum equal or slightly longer than the calyx tube.
  • Fruit cup-shaped or obconical, 6-10 mm × 7-12 mm, with 3 or 4 included or partly exserted valves.

E. urophylla occurs in open, often secondary montane forest and performs best on deep, moist, well-drained soils at (350-)500-3000 m altitude. Until 1977 E. urophylla was not treated as a species distinct from E. alba. As E. alba has been widely cultivated throughout the world (also under the name E. decaisneana) there is some confusion about the true nature of several provenances. The occurrence of hybrids between E. alba and E. urophylla as well as between the latter and E. saligna or E. tereticornis enhances the confusion.

Selected sources

16, 52, 62, 130, 193, 322a, 343, 540, 659, 715.

Main genus page

Authors

  • C.C.H. Jongkind (selection of species)