Ailanthus integrifolia (PROSEA)

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Plant Resources of South-East Asia
List of species

Ailanthus integrifolia Lamk

Protologue: Dict. 3(2): 417 (1792).


  • Ailanthus moluccana DC. (1825),
  • Ailanthus blancoi Merr. (1918),
  • Ailanthus peekelii Melch. (1930).

Vernacular names

  • White siris (En)
  • Indonesia: ai lanit (Moluccas), kayu ruris (Minahassa), pohon langit (Ambon)
  • Philippines: malasapsap (general), balokas, makaisa (Tagalog).
  • Vietnam: thanh thất lá nguyên.


Western India (Assam), southern Vietnam, throughout Malesia (except for the Lesser Sunda Islands) towards the Bismarck Archipelago and the Solomon Islands.


A. integrifolia is not used in traditional medicine, despite the active compounds revealed by phytochemical research. The wood is used as white siris; it is also used for local house building and furniture manufacture.


  • A large tree up to 60 m tall, bole branchless for up to 35 m, up to 85(-175) cm in diameter, bark surface smooth or irregularly fissured, pale brown or greyish.
  • Leaves paripinnate with 2-9 entire leaflets 10-40 cm long, lower surface sometimes pubescent and with a few large black glands.
  • Petals puberulous, carpels 5, puberulous.
  • Fruit a samara 11-22 cm long.

A. integrifolia is divided into two subspecies: subsp. integrifolia and subsp. calycina (Pierre) Nooteboom. The former has up to 15 mm long pedicels and 6-10 mm long petals and occurs in primary rain forest up to 900 m altitude throughout Malesia except for Java and the Lesser Sunda Islands and on the Bismarck Archipelago and the Solomon Islands. The latter has pedicels up to 5 mm long and petals c. 4 mm long and occurs in mixed seasonal primary forest in western India, southern Vietnam and Java.

The density of the wood is 330-390 kg/m3 at 12% moisture content. See also the table on wood properties. A. integrifolia is potentially of medicinal interest.

Selected sources

12, 53, 60, 145, 162, 227, 228, 233, 426, 527, 705, 731. (Timbers)


  • Council of Scientific and Industrial Research, 1985. The wealth of India: a dictionary of Indian raw materials & industrial products. Revised Edition. Vol. 1. Publications and Information Directorate, New Delhi, India. 513 pp.311, 406, 746, 949.


Main genus page


J.L.C.H. van Valkenburg (Medicinals)