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

For the taxonomic status of the oaks see The Plant List.[2]

Contents

Subgenus QuercusEdit

Section QuercusEdit

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 MesobalanusEdit

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 CerrisEdit

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

Section ProtobalanusEdit

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

Section LobataeEdit

The red oaks (synonym sect. Erythrobalanus). North, Central and South America. Styles long, acorns mature in 18 months(in most species),[4] very bitter, inside of acorn shell woolly.

Subgenus CyclobalanopsisEdit

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

NotesEdit

# 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 linksEdit

SourcesEdit

  • 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

ReferencesEdit

  1. ^ David J. Mabberley. 1987. The Plant-Book first edition (1987). Cambridge University Press: UK. ISBN 0-521-34060-8
  2. ^ http://www.theplantlist.org/tpl1.1/search?q=quercus
  3. ^ Borgardt, S. J.; Pigg, K. B. (1999). "Anatomical and developmental study of petrified Quercus (Fagaceae) fruits from the Middle Miocene, Yakima Canyon, Washington, USA" (PDF). American Journal of Botany. 86 (3): 307–325. 
  4. ^ Kershner, Bruce, and Craig Tufts. National Wildlife Federation Field Guide to Trees of North America. New York: Sterling Pub., 2008. Print.