Painted Tree of Heaven (Ailanthus scripta)

Chinese lacquer tree Varnish tree Japanese sumac
Silhouette: T. Michael Keesey / License

Ailanthus scripta (Toxicodendron vernicifluum): Facts & Care

In the mid-20th century, French botanists scouring the dense forests of Vietnam documented a unique tree they initially aligned with the heaven-reaching Ailanthus genus. This enigmatic plant, described under the scientific name Ailanthus scripta, was later recognized as a taxonomic synonym of the famous East Asian lacquer tree.

The natural range of this tree spans temperate and subtropical forests across East Asia, where it thrives in moist mountain soils. While its historical classification as Ailanthus scripta suggests a connection to benign ornamentals, its sap is actually loaded with urushiol, a highly active compound causing contact dermatitis.

Historically, the sticky resin harvested from these trunks has been used to create stunning, durable lacquerware that defines the artistic heritage of China and Japan. Modern botanists continue to study specimens of Ailanthus scripta to map the evolutionary history of these culturally significant, yet hazardous forest trees.

Taxonomy

  • ∟ царство Plantae
  • ∟ division Tracheophytes (Vascular Plants)
  • ∟ subdivision Spermatophytes (Seed plants)
  • ∟ Angiosperms
  • ∟ mesangiosperms (Core angiosperms)
  • ∟ eudicots
  • ∟ Superrosids
  • ∟ rosids
  • ∟ malvids
  • ∟ order Sapindales
  • ∟ family Simaroubaceae (Quassia family)
  • ∟ genus Ailanthus (Tree of heaven)
  • ∟ species Ailanthus scripta (Painted Tree of Heaven)

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Morphology

In its mature state, the tree develops a rounded canopy and can reach heights of up to 20 meters under optimal forest conditions. The bark is relatively smooth and grayish-brown, often displaying horizontal lenticels and minor fissures on older specimens.

The foliage is highly characteristic, consisting of large, alternate pinnate leaves that can measure up to 80 centimeters in length. The complex leaf structure displays several distinct features:

  • Leaflets: Usually 7 to 19 opposite, ovate to oblong leaflets with acuminate tips and entire margins.
  • Venation: Prominent pinnate veins that stand out on the lighter undersides of the leaves.
  • Secretory ducts: Internal resin canals that carry a milky latex, which quickly turns black upon exposure to oxygen.

During the flowering period, the tree produces small, inconspicuous, yellowish-green flowers arranged in loose, axillary panicles. These give way to clusters of small, dry, straw-colored drupes that contain a single seed each.

Flowering season

The tree typically produces its yellowish-green blossoms during late spring and early summer, mainly from May to June.

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Applications

The primary application of this species lies in the extraction of its sap to produce traditional East Asian lacquer, known for its extreme durability and high-gloss finish. This natural varnish has been applied to wooden utensils, religious artifacts, and furniture for over three thousand years.

In addition to craft applications, other parts of the plant serve various historical and regional uses:

  • Traditional Medicine: Dried resin has been utilized in regional medicinal practices to address internal parasites and stimulate blood circulation, though its toxic nature limits safe usage.
  • Seed Oil: The seeds yield a dense wax, historically used in making candles, polishes, and traditional soaps.
  • Timber: The wood is sometimes used for small-scale carving and light construction, although workers must take precautions against the irritating sap.

Interesting facts

The taxonomic classification of Ailanthus scripta reveals an interesting error made by French botanist François Gagnepain in 1944. He documented the species based on Indochinese collections, mistaking its compound leaves for those of an Ailanthus before later studies confirmed its true identity as a lacquer tree.

Several other remarkable aspects define this species and its traditional significance:

  • Ancient Durability: Urushiol polymerizes under warm, humid conditions rather than drying out, creating a coating so stable that lacquerware from ancient tombs remains perfectly preserved.
  • Lacquer Disease: Traditional artisans often develop a temporary immunity to the toxic sap over years of careful exposure, while beginners suffer from a severe skin rash known locally as lacquer sickness.
  • Historical Monopolies: In ancient Japan and China, the cultivation of these trees was tightly regulated by imperial decrees, and damaging a tree could result in severe penalties.

Geography of distribution

  • China
  • Japan
  • South Korea
  • North Korea
  • Vietnam
  • India

Sources

Technical Information

External Databases: GBIF, POWO, Tropicos

See also

White Siris

White Siris

Ailanthus triphysa

A tall evergreen rainforest tree native to Asia and Australia, famous for its aromatic halmaddi …

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