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]

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]

  • Ohwi, J. Flora of Japan, 1984. ISBN 978-0-87474-708-9
  • Soepadmo, E., Julia, S., & Rusea G. Fagaceae. In Tree Flora of Sabah and Sarawak, Volume 3, 2006. Soepadmo, E., Saw, L.G. eds. Government of Malaysia, Kuala Lumpur, Malaysia. ISBN 983-2181-06-2

References[edit]

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