Semecarpus anacardium (PROSEA)
- Family: Anacardiaceae
- Marking-nut tree, oriental cashew nut (En)
- Thailand: rakkhon (Kanchanaburi).
Originating from India, now also cultivated in Africa, Australia, and occasionally in South-East Asia.
The swollen pedicel looks like a fruit and is eaten after roasting; the kernel may be eaten, but needs careful shelling. Juice from the false fruit, mixed with lime water, gives a black marking ink. The nuts are used in tanning, the false fruits in dyeing. The pericarp contains about 9% of an irritating oil which is used in traditional medicine, but also in industry (in lacquers, paints, insulating material). The wood is used as charcoal.
- Tree, up to 15 m tall.
- Leaves simple.
- Flowers unisexual, seldom bisexual, greenish.
- Fruit a globose-ovoid drupe, reniform, 2 cm × 2.5 cm, black; hypocarp fleshy, equal to drupe.
On hill slopes, usually between 500-1000 m altitude. In India flowering in May-July, fruiting in March.
- Burkill, I.H., 1966. A dictionary of the economic products of the Malay Peninsula. 2nd ed. 2 Volumes. Ministry of Agriculture and Co-operatives, Kuala Lumpur, Malaysia. 2444 pp.
- Matthew, K.M., 1981-1983. The flora of the Tamilnadu Carnatic. 3 Volumes. The Rapinat Herbarium, Tiruchirapalli, India.
- van Steenis, C.G.G.J. et al. (Editors), 1950-. Flora Malesiana. Series 1. Vol. 1, 4-10. Centre for Research and Development in Biology, Bogor, Indonesia, and Rijksherbarium, Leiden, the Netherlands. Kluwer Academic Publishers, Dordrecht, Boston, London.
P.C.M. Jansen, J. Jukema, L.P.A. Oyen, T.G. van Lingen