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Styrax tonkinensis (Pierre) Craib et Hartwich - Styracaceae - Siam Benzoin, Siam-Benzoeharzbaum
Tree 6-30 m tall, native to Southeast Asia (Cambodia, Laos, Thailand, Vietnam, China); bark dark gray; leaves alternate, leaf blade elliptic to ovate, margin entire or apically serrate; flowers 1.2-2.5 cm, white.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200017762
The volatile extract of Siam benzoin gum contains mainly benzyl benzoate (76-80%) and benzoic acid (12.5%), with some methyl benzoate (1.5%) and allyl benzoate (1.5%).
[Volatile constituents of benzoin gums: Siam and Sumatra. Part 1. Fernandez, X., Lizzani‐Cuvelier, L., Loiseau, A. M., Périchet, C., Delbecque, C., Flavour and fragrance journal, Vol.18(4), 2003, 328-333]
