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- Betula uber - Wikipedia
- Virginia Roundleaf Birch / Center For Plant Conservation
- Betula uber, Virginia roundleaf birch - US Forest Service
- Betula uber - U.S. Fish and Wildlife Service
- Betula uber - USDA Plants Database
- Betula lenta - Sheffield's Seed Company
- Tree Information- VA Big Trees
- NatureServe Explorer 2.0
- ( Betula uber ) - treetrail.net
- Betula uber - FNA
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Betula uber, the 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.
Description
It is a moderately sized tree, growing up to 15 metres (49 ft) 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 centimetres (2.0 in) long. The catkin is up to 2.8 centimetres (1.1 in) 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.
Taxonomy
The tree was first described in 1914 as a variety of Betula lenta, and elevated to species status in 1945. The cladistics of the tree remain unresolved. It hybridizes with B. lenta and it has been suggested that it is actually a round-leaved mutant form of B. lenta. Some authorities prefer to treat it as a variety.
Conservation
After it was first discovered in 1914, the tree was not seen again and was thought to be extinct until 1975, when some individuals were found. 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 began. Many seedlings were sprouted in greenhouses and planted in the forest. By 1995, there were 20 populations and it had been downlisted to threatened status in December 1994. 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. NatureServe considers the species Critically Imperiled.
References
External links
World Conservation Monitoring Centre (1998). "Betula lenta subsp. uber". IUCN Red List of Threatened Species. 1998: e.T37556A10063966. doi:10.2305/IUCN.UK.1998.RLTS.T37556A10063966.en. Retrieved 16 November 2021.
USDA Plants Profile
Kata Kunci Pencarian:
Betula uber - Alchetron, The Free Social Encyclopedia
Betula uber - Alchetron, The Free Social Encyclopedia
Betula uber - Alchetron, The Free Social Encyclopedia
Betula uber - Alchetron, The Free Social Encyclopedia
Virginia Roundleaf Birch - Betula uber
Virginia Roundleaf Birch - Betula uber
Virginia Roundleaf Birch - Betula uber
Images of the Virginia Roundleaf Birch (Betula uber) - LeafSnap
Images of the Virginia Roundleaf Birch (Betula uber) - LeafSnap
Images of the Virginia Roundleaf Birch (Betula uber) - LeafSnap
Images of the Virginia Roundleaf Birch (Betula uber) - LeafSnap
Images of the Virginia Roundleaf Birch (Betula uber) - LeafSnap
betula uber
Daftar Isi
Betula uber - Wikipedia
Betula uber, the 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. It is a moderately sized tree, growing up to 15 metres (49 ft) tall.
Virginia Roundleaf Birch / Center For Plant Conservation
Betula uber was formally listed as endangered in 1978, but was downlisted to threatened in 1995 after 20 additional populations were established. Although very similar to the widespread black or sweet birch (Betula lenta), it differs primarily in growth habit and having blunt or rounded leaves.
Betula uber, Virginia roundleaf birch - US Forest Service
Betula uber, Virginia roundleaf birch ESA Status. Visit the U.S. Fish & Wildlife Service Species Profile link below for links to listing and other USFWS documents. Listed Threatened 1978; Recovery Plan 1990 (PDF, 4.4 MB) Threats
Betula uber - U.S. Fish and Wildlife Service
All introduced populations are on U.S. Forest Service lands within the Mount Rogers National Recreation Area. This deciduous, single-trunked tree reaches a height of approximately 50 feet. The bark is dark brownish-black and has a wintergreen aroma when bruised. Explore the information available for this taxon's timeline.
Betula uber - USDA Plants Database
Betula uber (Ashe) Fernald Virginia roundleaf birch. Profile pages. General; Images; Synonyms; Rarity; Related Links; Sources; Virginia roundleaf birch ... Betula L. - birch P: Species Betula uber (Ashe) Fernald - Virginia roundleaf birch P: PLANTS Database Home Topics; Team; Downloads; Partners; Related Tools; Help;
Betula lenta - Sheffield's Seed Company
* 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.
Tree Information- VA Big Trees
Common Name: Virginia round-leaf birch. Scientific Name: Betula uber. Native/Naturalized: Native to Virginia. Database ID: 34. Status: alive. National Champion: no. Virginia Champion: yes. Circumference: 38 in. Height: 59 ft. Crown: 28 ft. Points: 104. Date Last Measured: 2023. Last Measured by: Alex Adams, John Peterson. Date First Measured: 1976.
NatureServe Explorer 2.0
Betula uber, known from a single population, differs from the widespread black birch (Betula lenta) in having blunt leaves. It was originally described as a variety of B. lenta (Ashe 1918). Kartesz (1994, 1999) recognizes this as a full species, as does the Flora of North America (1997) and the U.S. Fish and Wildlife Service (formal listing as ...
( Betula uber ) - treetrail.net
(Betula uber) Virginia Roundleaf Birch may be the rarest native U.S. tree species still existing in the wild. The only known natural population grows along a creek in Smyth County in southwest Virginia.
Betula uber - FNA
Twigs with taste and odor of wintergreen when crushed, glabrous, covered with small resinous glands.