List of Quercus species

From Wikipedia, the free encyclopedia
  (Redirected from White oak)
Jump to navigation Jump to search

The genus Quercus contains about 500 species,[1] some of which are listed here. The genus, as is the case with many large genera, is divided into subgenera and sections.

Legend[edit]

Species with evergreen foliage ("live oaks") are tagged '#'. Species in the genus have been recategorized between deciduous and evergreen on numerous occasions, although this does not necessarily mean that species in the two groups are closely related.

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 Ponticae[edit]

Western Asia and Western North America, produces catkins up to 10cm long, acorns mature annually.[3]

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 and 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 and South America. Styles long, acorns mature in 18 months (in most species),[4] very bitter, inside of acorn shell woolly.

Subgenus Cyclobalanopsis[edit]

Illustration of Quercus lamellosa, showing acorns in clusters, with visible rings on their cups

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

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. ^ "Quercus L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 30 September 2020.
  2. ^ Borgardt, S. J.; Pigg, K. B. (1999). "Anatomical and developmental study of petrified Quercus (Fagaceae) fruits from the Middle Miocene, Yakima Canyon, Washington, USA". American Journal of Botany. 86 (3): 307–325. doi:10.2307/2656753. JSTOR 2656753. PMID 10077494.
  3. ^ Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min; Hipp, Andrew L. (2017), Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier; Sancho-Knapik, Domingo (eds.), "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns", Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L., Tree Physiology, Cham: Springer International Publishing, pp. 13–38, doi:10.1007/978-3-319-69099-5_2, ISBN 978-3-319-69099-5, retrieved 2021-11-16
  4. ^ Kershner, Bruce, and Craig Tufts. National Wildlife Federation Field Guide to Trees of North America. New York: Sterling Pub., 2008. Print.

External links[edit]