List of Quercus species

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The genus Quercus (oak) contains about 600 species,[1] some of which are listed here.

Subgenus Quercus[edit]

Section Quercus[edit]

"White oak" redirects here. For the North American species called White Oak, see Quercus alba.

The white oaks (synonym sect. Lepidobalanus or Leucobalanus). Europe, Asia, north Africa, North America. Styles short; acorns mature in 6 months, sweet or slightly bitter, inside of acorn shell hairless.

Section Mesobalanus[edit]

Europe, Asia, north Africa. Styles long; acorns mature in 6 months, bitter, inside of acorn shell hairless (closely related to sect. Quercus and sometimes included in it).

Section Cerris[edit]

Europe, Asia, north Africa. Styles long; acorns mature in 18 months, very bitter, inside of acorn shell hairless or slightly hairy.

Section Protobalanus[edit]

The intermediate oaks. Southwest USA & northwest Mexico. Styles short, acorns mature in 18 months, very bitter, inside of acorn shell woolly.

Section Lobatae[edit]

The red oaks (synonym sect. Erythrobalanus). North, Central & South America. Styles long, acorns mature in 18 months, very bitter, inside of acorn shell woolly.

Subgenus Cyclobalanopsis[edit]

The ring-cupped oaks (synonym genus Cyclobalanopsis). Eastern and southeastern Asia. They are distinct from subgenus Quercus in that they have acorns with distinctive cups bearing concrescent rings of scales; they commonly also have densely clustered acorns, though this does not apply to all of the species. About 150 species.

Selected species

Notes[edit]

# Species with evergreen foliage ("live oaks") are tagged #. Note that the change from deciduous to evergreen character (or vice-versa) has evolved on numerous occasions in Quercus, and does not necessarily indicate that the species concerned are closely related.

External links[edit]

Sources[edit]

References[edit]

  1. ^ David J. Mabberley. 1987. The Plant-Book first edition (1987). Cambridge University Press: UK. ISBN 0-521-34060-8