Circumboreal Region

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Floristic regions in Europe according to Wolfgang Frey and Rainer Lösch

The Circumboreal Region in phytogeography is a floristic region within the Holarctic Kingdom in Eurasia and North America, as delineated by such geobotanists as Josias Braun-Blanquet and Armen Takhtajan.

It is the largest floristic region in the world by area, comprising most of Canada, Alaska, Europe, Caucasus and Russia, as well as North Anatolia (as the southernmost part of the region) and parts of northern New England, Michigan, and Minnesota. Northern portions of the region include polar desert, taiga[1] and tundra biomes. Many geobotanists divide Eurasian and North American areas into two distinct regions. The continents, however, share much of their boreal flora (e.g. Betula nana, Alnus viridis, Vaccinium vitis-idaea, Arctostaphylos uva-ursi). The flora was severely impoverished during glaciations in the Pleistocene. The region is bordered by Eastern Asiatic, North American Atlantic, Rocky Mountain, Mediterranean and Irano-Turanian Regions.

There are no biological families endemic to this region, but it has endemic genera (e.g. Lunaria, Borodinia, Gorodkovia, Redowskia, Soldanella, Physospermum, Astrantia, Thorella, Pulmonaria, Erinus, Ramonda, Haberlea, Jankaea, Stratiotes, Telekia) and a lot of endemic species, especially in the mountains.

Floristic provinces

It is subdivided into a number of floristic provinces. Their delineation is debatable. According to a version of Takhtajan's classification, these are the Arctic, Atlantic European, Central European, Illyrian, Euxinian, Caucasian, Eastern European, Northern European, West Siberian, Altai-Sayan, Central Siberian, Transbaikalian, Northeastern Siberian, Okhotsk-Kamtchatkan and Canadian Provinces.

See also

Notes

  1. ^ C.Michael Hogan. 2011
  2. ^ David Lewis Lentz. 2000

Bibliography

  • C.Michael Hogan. 2011. Taiga. eds. M.McGinley & C.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC
  • David Lewis Lentz. 2000. Imperfect balance: landscape transformations in the Precolumbian Americas, Science, 547 pages, page
  • Robert F. Thorne. Phytogeography of North America North of Mexico. Flora of North America, Vol. 1, Ch. 6.
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