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- Q1343018 subject Q21979441.
- Q1343018 subject Q6865034.
- Q1343018 subject Q8298654.
- Q1343018 subject Q8413367.
- Q1343018 subject Q8428265.
- Q1343018 subject Q8461936.
- Q1343018 subject Q8755382.
- Q1343018 subject Q8872133.
- Q1343018 abstract "Betula uber (Virginia Round-leaf Birch) is a rare species of tree in the birch family. One of the most endangered species of North American trees, it is endemic to Smyth County, in the U.S. state of Virginia. It is part of the temperate broadleaf and mixed forests biome.The tree was first described in 1918 as a variety of Betula lenta, and elevated to species status in 1945. It hybridizes with B. lenta and it has been suggested that it is actually a round-leaved mutant form of that species. Some authorities prefer to treat it as a variety.After it was first discovered, the tree was not seen again and was thought to be extinct until 1975, when some individuals were located. These 18 adult trees and 23 saplings and seedlings were in a forest along the degraded banks of Cressy Creek on Smyth County, Virginia. The tree was federally listed as an endangered species and conservation efforts were begun. Many seedlings were sprouted in greenhouses and planted in the forest. By 1995 there were 20 populations and it was downlisted to threatened status. The tree was propagated in order to discourage collectors from taking wild specimens, or vandals from destroying them. A recent count estimated 961 individuals in the wild as of 2006. Eight of these are in the original creekside population. The species will not be removed from the endangered species list yet because it has not been observed reproducing sexually, and naturally, more than once. The expansion of its range is limited because the area is surrounded by agricultural land, but the territory on which the tree occurs is not immediately threatened.This is a tree of moderate size, growing up to 15 meters tall. The crown is compact. The bark is aromatic and dark brown or black in color. The leaf is round or slightly oval with a heart-shaped base and a toothed edge and measures up to 5 centimeters long. The catkin is up to 2.8 centimeters long and contains tiny samaras measuring 2 millimeters in length. The tree is wind-pollinated and reproduces by seed. Seed production is much heavier in some years than in others. The tree's lifespan is around 50 years.".
- Q1343018 class Q165468.
- Q1343018 conservationStatus "CR".
- Q1343018 conservationStatusSystem "IUCN2.3".
- Q1343018 division Q25314.
- Q1343018 family Q156064.
- Q1343018 genus Q25243.
- Q1343018 kingdom Q756.
- Q1343018 order Q21881.
- Q1343018 order Q338878.
- Q1343018 thumbnail Betula_uber_JPG1A.jpg?width=300.
- Q1343018 wikiPageExternalLink www.iucnredlist.org.
- Q1343018 wikiPageExternalLink profile?symbol=BEUB.
- Q1343018 wikiPageExternalLink all.
- Q1343018 wikiPageWikiLink Q101998.
- Q1343018 wikiPageWikiLink Q1047706.
- Q1343018 wikiPageWikiLink Q10884.
- Q1343018 wikiPageWikiLink Q11394.
- Q1343018 wikiPageWikiLink Q11451.
- Q1343018 wikiPageWikiLink Q123452.
- Q1343018 wikiPageWikiLink Q123509.
- Q1343018 wikiPageWikiLink Q1370.
- Q1343018 wikiPageWikiLink Q1385709.
- Q1343018 wikiPageWikiLink Q156064.
- Q1343018 wikiPageWikiLink Q165044.
- Q1343018 wikiPageWikiLink Q165468.
- Q1343018 wikiPageWikiLink Q182353.
- Q1343018 wikiPageWikiLink Q188419.
- Q1343018 wikiPageWikiLink Q2138208.
- Q1343018 wikiPageWikiLink Q217753.
- Q1343018 wikiPageWikiLink Q21881.
- Q1343018 wikiPageWikiLink Q21979441.
- Q1343018 wikiPageWikiLink Q227763.
- Q1343018 wikiPageWikiLink Q25243.
- Q1343018 wikiPageWikiLink Q25314.
- Q1343018 wikiPageWikiLink Q2743374.
- Q1343018 wikiPageWikiLink Q338878.
- Q1343018 wikiPageWikiLink Q3481436.
- Q1343018 wikiPageWikiLink Q35657.
- Q1343018 wikiPageWikiLink Q378896.
- Q1343018 wikiPageWikiLink Q40763.
- Q1343018 wikiPageWikiLink Q42621.
- Q1343018 wikiPageWikiLink Q475697.
- Q1343018 wikiPageWikiLink Q6160.
- Q1343018 wikiPageWikiLink Q622896.
- Q1343018 wikiPageWikiLink Q6865034.
- Q1343018 wikiPageWikiLink Q756.
- Q1343018 wikiPageWikiLink Q8298654.
- Q1343018 wikiPageWikiLink Q8413367.
- Q1343018 wikiPageWikiLink Q8428265.
- Q1343018 wikiPageWikiLink Q8461936.
- Q1343018 wikiPageWikiLink Q8755382.
- Q1343018 wikiPageWikiLink Q8872133.
- Q1343018 familia Q156064.
- Q1343018 genus "Betula".
- Q1343018 ordo Q21881.
- Q1343018 regnum "Plantae".
- Q1343018 status "CR".
- Q1343018 statusSystem "IUCN2.3".
- Q1343018 unrankedClassis Q165468.
- Q1343018 unrankedDivisio Q25314.
- Q1343018 unrankedOrdo Q338878.
- Q1343018 type Eukaryote.
- Q1343018 type Plant.
- Q1343018 type Species.
- Q1343018 type Thing.
- Q1343018 type Q19088.
- Q1343018 type Q756.
- Q1343018 comment "Betula uber (Virginia Round-leaf Birch) is a rare species of tree in the birch family. One of the most endangered species of North American trees, it is endemic to Smyth County, in the U.S. state of Virginia. It is part of the temperate broadleaf and mixed forests biome.The tree was first described in 1918 as a variety of Betula lenta, and elevated to species status in 1945. It hybridizes with B. lenta and it has been suggested that it is actually a round-leaved mutant form of that species.".
- Q1343018 label "Betula uber".
- Q1343018 depiction Betula_uber_JPG1A.jpg.