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Published In: Species Plantarum 2: 994. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: Over 400 species are distributed in America, temperate Europe, Asia, and sub-tropical Africa. Represented here by 6 species.


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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.

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1 Leaves pinnatifid or –partite, auricled at the base Quercus robur
+ Leaves entire or spiny-toothed, not auricled at the base (2)
2 (1) Bract less than 2.5 mm long. Styles linear or clavate. The cupule of imbricate scales (3)
+ Bract 3-4 mm long. Styles sub-capitate. The accrescent scales of the cupule in annular rings Quercus glauca
3 (2) Lower leaf surface white-tomentose to glabrescent and pale green. Acorn ovoid or oblong, the cupule covering 1/3 to 2/3 of it (4)
+ Lower leaf surface rusty tomentose. Acorn subglobose, the cupule covering only its base Quercus semecarpifolia
4 (3) Leaves entire to spiny toothed, upper surface green, lower pale to white tomentose, becoming glabrescent (5)
+ Leaves always coarsely toothed. Upper leaf surfaces dark green and spiny, lower white tomentose Quercus incana
5 (4) Small tree or shrub. Young shoots and under surfaces of leaves stellate pubescent. Anthers hairy. Acorn more or less cylindric Quercus baloot
+ A medium to large sized tree. Young shoots and under surfaces of leaves glabrescent. Anthers glabrous. Acorn more or less ovoid Quercus dilatata
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