This article needs additional citations for verification . (March 2009) (Learn how and when to remove this template message)
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, taigaand 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 many endemic species, especially in the mountains.
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.
Saxifraga is the largest genus in the family Saxifragaceae, containing about 440 species of holarctic perennial plants, known as saxifrages or rockfoils. The Latin word saxifraga means literally "stone-breaker", from Latin saxum + frangere. It is usually thought to indicate a medicinal use for treatment of urinary calculi, rather than breaking rocks apart.
The Madrean Region is a floristic region within the Holarctic Kingdom in North America, as delineated by Armen Takhtajan and Robert F. Thorne. It occupies arid or semiarid areas in the southwestern United States and northwestern Mexico and is bordered by the Rocky Mountain Region and North American Atlantic Region of the Holarctic Kingdom in the north and in the east, Caribbean Region of the Neotropical Kingdom in the south.
The Western Himalayan alpine shrub and meadows is a montane grasslands and shrublands ecoregion of Nepal, India, and Tibet, which lies between the tree line and snow line in the western portion of the Himalaya Range.
Giardino della flora appenninica di Capracotta is a botanical garden of alpine flowers located at 1,550 meters altitude at the base of Monte Campo, along the main road towards Prato Gentile in Capracotta, Province of Isernia, Molise, Italy. It is open daily in the warmer months.
The Orto Botanico di Bergamo "Lorenzo Rota" is a botanical garden located at the top of a long stairway from Scaletta di Colle Aperto, Bergamo, Lombardy, Italy. It is open daily during the warmer months.
The Giardino Montano per la Conservazione della Biodiversità "Ruggero Tomaselli", also known as the Giardino Botanico Alpino "Ruggero Tomaselli" and the Giardino Botanico "Ruggero Tomaselli", is a 70-hectare (170-acre) nature preserve, arboretum and botanical garden in Italy. It is located inside the Cittadella di Scienze della Natura at the summit of the Campo dei Fiori di Varese, in the Province of Varese, Lombardy. It is open on weekends in the warmer months.
The Giardino Botanico Alpinia is a botanical garden specializing in alpine plants, located at 800 m altitude above Stresa on Lake Maggiore, Province of Verbano-Cusio-Ossola, Piedmont, Italy. It can be reached via the Lido di Carciano - Alpino - Mottarone cable car, and is open daily in the warmer months.
The Botanischer Garten der Technischen Universität Dresden, also known as the Botanischer Garten Dresden or Dresden Botanical Garden, is a botanical garden maintained by the Dresden University of Technology. It is located in the north-west section of the Großer Garten at Stübelallee 2, Dresden, Saxony, Germany. It is open daily without charge.
The Rennsteiggarten Oberhof is a botanical garden specializing in mountain flora, located in Rennsteig at Am Pfanntalskopf 3, Oberhof, Thuringia, Germany. It is open daily in the warmer months; an admission fee is charged.
Catabrosa is a small but widespread genus of plants in the grass family native to temperate areas of Eurasia, the Americas, and a few places in Africa.
The Alps are one of the great mountain range systems of Europe stretching approximately 1,200 kilometres (750 mi) across eight Alpine countries from Austria and Slovenia in the east, Switzerland, Liechtenstein, Germany, France to the west and Italy and Monaco to the south. The flora of the Alps are diverse. In the mountains, the vegetation gradually changes with altitude, sun exposure, and location on the mountain. There are five successive life zones, each with distinct landscapes and vegetation characteristics: premontane, montane, subalpine, alpine, and alvar.
The flora of Lebanon includes approximately 2,600 plant species. Situated on the eastern coast of the Mediterranean Basin, Lebanon is a reservoir of plant diversity and one of the world's biodiversity hotspots for conservation priorities. Endemic species constitute 12% of the Lebanese flora; 221 plant species are broad endemics and 90 are narrow endemics. Important Plant Areas (IPAs) featuring the country exceptional botanical richness were defined in 2018.
Tusheti Strict Nature Reserve is located in the Tusheti Mountainous region in the north-eastern part of Georgia. Visitors center is located in village lower Alvani, Akhmeta Municipality.
Ritsa Strict Nature Reserve is a protected area in the Gudauta District of Abkhazia, Georgia. Reserve main goal is protecting Lake Ritsa and flora and fauna in surrounding mountainous region.
Petrorhagia saxifraga, known as tunic flower or coat flower, is a small, herbaceous flowering plant in the pink family, Caryophyllaceae. It is native to parts of Europe and introduced to the United States and Canada, Great Britain, and Sweden. Petrorhagia saxifraga is also known as tunic saxifrage, pink saxifrage, or just pink.