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Rhus verniciflua - Stokes.

Lacquer Tree

Author	Stokes.	Botanical references	11, 109, 200
Family	Anacardiaceae	Genus	Rhus
Synonyms	Rhus vernicifera - DC. Toxicodendron vernicifluum - (Stokes.)F.A.Barkley.
Known Hazards	The plant contains toxic substances that can cause severe irritation to some people[8, 19]. The sap can be particularly caustic[11]. All parts of the plant contain resinous phenolic compounds known as urushiols. Direct contacr with the plant, exposure to smoke or fumes from a burning plant or even contact with pets or animals that have touched the plant can cause severe allergic dermatitis in some individuals. There is usually a latent period of about 12 - 24 hours from the moment of contact, this is followed by a reddening and severe blistering of the skin. Even plant specimens 100 or more years old can cause problems[274].
Range	E. Asia - China, Japan.
Habitat	Woods and thickets on mountain slopes[109], usually around 1200 metres[64].
Edibility Rating	0 (1-5)	Medicinal Rating	1 (1-5)

Physical Characteristics

A decidious Tree growing to 15m by 10m.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires moist soil.

Habitats

Woodland Garden; Canopy;

Edible Uses

None known

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Emmenagogue; Stimulant; Tonic; Vermifuge.

Stimulant, tonic[178]. The leaves are used in the treatment of wasting diseases and internal parasites[218]. The seed is haemostatic and is used in the treatment of dysentery[218]. A resin from the plant is emmenagogue, haemolytic, stimulant, tonic and vermifuge[218]. Some caution is advised in the use of the leaves and stems of this plant, see the notes above on toxicity.

Other Uses

Dye; Lacquer; Mordant; Oil; Wax.

A non-drying oil is obtained from the fruit and is used in making candles[1, 11, 46, 57, 74, 109]. The fruit contains about 25% fat[218]. The fruit is crushed, heated and then crushed to extract the oil[K]. The oil attains a tallow-like consistency on standing and is used to make candles. These burn brilliantly, though they emit a pungent smoke[4]. The sap can be used as a varnish or a lacquer. It is obtained by incision of the stem[1, 4, 11, 19, 57, 74], which is best done in mid-summer[64]. The lacquer is frequently used in Japanese art, it requires a damp atmosphere in which to dry and harden, a moist cave being ideal[64]. It is resistant to acids, alkalis, alcohol and temperatures up to 70°c[171]. The leaves and galls formed as a result of insect damage are rich in tannin[4]. The leaves can be collected as they fall in the autumn and used as a brown dye or as a mordant[169].

Cultivation details

Succeeds in a well-drained fertile soil in full sun[11, 200]. One report says that this species is only hardy into zone 9 (tolerating only occasional light frosts)[200] but there are large healthy trees at Cambridge and Edinburgh Botanical gardens, and both sites had fruiting trees in September 1989[K]. Plants have brittle branches and these can be broken off in strong winds[200]. Plants are also susceptible to coral spot fungus[11]. Plants in this genus are notably resistant to honey fungus[200]. Cultivated for its lacquer in the warmer areas of Japan[58, 109]. Many of the species in this genus, including this one, are highly toxic and can also cause severe irritation to the skin of some people, whilst other species are not poisonous. It is relatively simple to distinguish which is which, the poisonous species have axillary panicles and smooth fruits whilst non-poisonous species have compound terminal panicles and fruits covered with acid crimson hairs[1, 4]. The toxic species are sometimes separated into their own genus, Toxicodendron, by some botanists[200]. Partly dioecious. Male and female plants must be grown if seed is required.

Propagation

Seed - best sown in a cold frame as soon as it is ripe. Pre-soak the seed for 24 hours in hot water (starting at a temperature of 80 - 90c and allowing it to cool) prior to sowing in order to leach out any germination inhibitors[200]. The stored seed also needs hot water treatment and can be sown in early spring in a cold frame[200]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Cuttings of half-ripe wood, 10cm with a heel, July/August in a frame[200]. Root cuttings 4cm long taken in December and potted up vertically in a greenhouse. Good percentage[78, 200]. Suckers in late autumn to winter[200].

Links

This plant is also mentioned in the following PFAF articles: Alternative Lighting: Plant Oils and Waxes, Vegtable Oils.

References

[K] Ken Fern
Notes from observations, tasting etc at Plants For A Future and on field trips.

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[4] Grieve. A Modern Herbal. Penguin 1984 ISBN 0-14-046-440-9
Not so modern (1930's?) but lots of information, mainly temperate plants.

[8] Ceres. Free for All. Thorsons Publishers 1977 ISBN 0-7225-0445-4
Edible wild plants in Britain. Small booklet, nothing special.

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[19] Stary. F. Poisonous Plants. Hamlyn 1983 ISBN 0-600-35666-3
Not very comprehensive, but easy reading.

[46] Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959
An excellent and very comprehensive guide but it only gives very short descriptions of the uses without any details of how to utilize the plants. Not for the casual reader.

[57] Schery. R. W. Plants for Man. 0
Fairly readable but not very comprehensive. Deals with plants from around the world.

[58] Ohwi. G. Flora of Japan. (English translation) Smithsonian Institution 1965
The standard work. Brilliant, but not for the casual reader.

[64] Howes. F. N. Vegetable Gums and Resins. Faber 0
A very good book dealing with the subject in a readable way.

[74] Komarov. V. L. Flora of the USSR. Israel Program for Scientific Translation 1968
An immense (25 or more large volumes) and not yet completed translation of the Russian flora. Full of information on plant uses and habitats but heavy going for casual readers.

[78] Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948
A bit dated but a good book on propagation techniques with specific details for a wide range of plants.

[109] Wilson. E. H. Plantae Wilsonae. 0
Details of the palnts collected by the plant collector E. H. Wilson on his travels in China. Gives some habitats. Not for the casual reader.

[169] Buchanan. R. A Weavers Garden. 0
Covers all aspects of growing your own clothes, from fibre plants to dyes.

[171] Hill. A. F. Economic Botany. The Maple Press 1952
Not very comprehensive, but it is quite readable and goes into some a bit of detail about the plants it does cover.

[178] Stuart. Rev. G. A. Chinese Materia Medica. Taipei. Southern Materials Centre 0
A translation of an ancient Chinese herbal. Fascinating.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[218] Duke. J. A. and Ayensu. E. S. Medicinal Plants of China Reference Publications, Inc. 1985 ISBN 0-917256-20-4
Details of over 1,200 medicinal plants of China and brief details of their uses. Often includes an analysis, or at least a list of constituents. Heavy going if you are not into the subject.

[274] Diggs, Jnr. G.M.; Lipscomb. B. L. & O'Kennon. R. J Illustrated Flora of North Central Texas Botanical Research Institute, Texas. 1999 ISBN 1-889878-01-4
An excellent flora, which is also available on-line.

Readers Comments

Plants for a Future does not verify the accuracy of reader comments, use at your own risk. In particular Plants For A Future can not take any responsibility for any adverse effects from the use of plants. You should always consult a professional before using plants medicinally.

Rhus verniciflua

Angel Tue Mar 31 2009

En este link se encuentra un estudio sobre el efecto de los compuestos de este arbol para tratar los productos AGE que son los principales responsables de los procesos del envejecimiento humano.

Pharmaceutical Society Japan Estracto de la planta y usos en combatir los AGE

Rhus verniciflua

Angel Tue Mar 31 2009

Extracto usado como antioxidante

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