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Quercus Linn., Sp. Pl. 994. 1753. Gen. Pl. ed. 5.431.1754; Boiss., Fl. Or. 4:1162. 1879; Hook. f., Fl. Brit. Ind. 5:600.1888; Collett, Fl. Siml. 473.1902; Kanjilal, For. Fl. Siw. Jaun., For. Div. 400.1911; Brandis, Ind. Trees, 626.1911; Camus, A. Les Chenes, Monog. du genre Quercus, Vol 1-3. 1934-54; Parker, For. Fl. Punj. ed. 3.493. 1956; Maleev in Kom., Fl. URSS. 5:322.1936; Hutch., Gen. Fl. Pl.2:131. 1967; Menitsky in Rech.f., Fl. Iran. 77:3.1971.
Monoecious, evergreen or deciduous trees, rarely shrubs. Leaves usually toothed or lobed, stipulate. Male flowers in catkins, solitary or in clusters on them. Perianth campanulate or cupular, 3-6-lobed; stamens usually 6, pistillode sometimes present. Female flowers solitary or in clusters of 3 on erect spikes; perianth surrounded by an involucre of scales; ovary 3-5-locular; styles usually as many as the loculi. The fruit partially enclosed in a cupule formed by the accrescent and hardened involucral scales; seed solitary, rarely more.
Over 400 species are distributed in America, temperate Europe, Asia, and sub-tropical Africa. Represented here by 6 species.
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| 1 |
Leaves pinnatifid or –partite, auricled at the base |
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Quercus robur |
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Leaves entire or spiny-toothed, not auricled at the base |
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(2) |
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| 2 (1) |
Bract 3-4 mm long. Styles sub-capitate. The accrescent scales of the cupule in annular rings |
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Quercus glauca |
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Bract less than 2.5 mm long. Styles linear or clavate. The cupule of imbricate scales |
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(3) |
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| 3 (2) |
Lower leaf surface rusty tomentose. Acorn subglobose, the cupule covering only its base |
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Quercus semecarpifolia |
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Lower leaf surface white-tomentose to glabrescent and pale green. Acorn ovoid or oblong, the cupule covering 1/3 to 2/3 of it |
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(4) |
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| 4 (3) |
Leaves always coarsely toothed. Upper leaf surfaces dark green and spiny, lower white tomentose |
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Quercus incana |
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Leaves entire to spiny toothed, upper surface green, lower pale to white tomentose, becoming glabrescent |
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(5) |
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| 5 (4) |
Small tree or shrub. Young shoots and under surfaces of leaves stellate pubescent. Anthers hairy. Acorn more or less cylindric |
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Quercus baloot |
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A medium to large sized tree. Young shoots and under surfaces of leaves glabrescent. Anthers glabrous. Acorn more or less ovoid |
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Quercus dilatata |
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Lower Taxa
Related Synonym(s):
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