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A deciduous or almost evergreen shrub or small tree up to about 20 ft high; buds ovoid, slightly downy; young stems soon glabrous. Leaves leathery, oblong to oblong-elliptic, 13⁄4 to 23⁄8 in. long, 5⁄8 to 2 in. wide, obtuse at the apex, glabrous on both sides except for a few scattered hairs beneath, main lateral veins in mostly five to seven pairs, intercalary veins present, margins dentate, crenate, or sinuate, the teeth usually mucronate; petiole 1⁄4 to 1⁄2 in. long. Fruits more or less as in Q. faginea but scales of acorn-cups usually swollen.
Native of the N. Aegean and N.W. Anatolia, rare in cultivation. The galls produced by this oak are used in dyeing, whence the specific epithet, and also in medicine.
Q. boissieri – The correct name for this oak, considered as a subspecies of Q. infectoria, would be subsp. veneris (A. Kerner) Meikle, from Q. lusitanica subsp. veneris (A. Kerner) Holmboe (Q. veneris A. Kerner).
Q. boissieri has been reintroduced to Kew by seeds collected by Fliegner and Simmons in north-western Iran in 1977. The old tree at Kew, pl. 1870, measures 54 × 51⁄2 ft (1986).
specimens: Kew, pl. 1873, 66 × 51⁄2 ft (1986); Tortworth, Glos., 80 × 91⁄4 ft (1973).
Q. infectoria subsp. boissieri (Boiss.) Gurke