|Subgenus:||Betula subg. Chamaebetula|
It is a monoecious shrub growing up to 1–1.2 metres (3 ft 3 in–3 ft 11 in) high. The bark is non-peeling and shiny red-copper colored. The leaves are rounded, 6–20 millimetres (0.24–0.79 in) diameter, with a bluntly toothed margin. The leaves are a darker green on their upper surface. Leaf growth occurs after snow melt and become red in autumn.
Betula nana is native to arctic and cool temperate regions of Greenland, Iceland, northern Europe, northern Asia and northern North America and it will grow in a variety of conditions. Outside of far northern areas, it is usually found growing only in mountains above 300 metres (980 ft), up to 835 metres (2,740 ft) in Scotland and 2,200 metres (7,200 ft) in the Alps. Its northern range limit is on Svalbard, where it is confined to warm sites. In the UK Betula nana is at its southern range limit, with many populations having declined significantly in recent decades.
In general, it favors wet but well drained sites with a nutrient poor, acidic soil which can be xeric and rocky. B. nana has a low tolerance for shade.
There are two subspecies:
- Betula nana subsp. nana. Canada (Baffin Island), Greenland, northern Europe (south to the Alps at high altitudes), northwestern Asia. Young twigs hairy, but without resin; leaves longer (to 20 mm), usually as long as broad.
- Betula nana subsp. exilis. Northeastern Asia, northern North America (Alaska, Canada east to Nunavut). Young twigs hairless or with only scattered hairs, but coated in resin; leaves shorter (not over 12 mm long), often broader than long.
The genome of B. nana has been sequenced by a team of scientists led by Richard Buggs at Queen Mary University of London, using a plant from the Dundreggan Estate in Scotland owned by Trees for Life (Scotland).
- Stritch, L. (2014). "Betula nana". IUCN Red List of Threatened Species: e.T194495A2341542.
- Kelvin S.-H. Peh; Richard T. Corlett; Yves Bergeron, eds. (2015). Routledge Handbook of Forest Ecology. Routledge. p. 12. ISBN 978-0-415-73545-2.
- Ewing, Susan. The Great Alaska Nature Factbook. Portland: Alaska Northwest Books, 1996.
- Borrell, James S.; Wang, Nian; Nichols, Richard A.; Buggs, Richard J. A. (15 August 2018). "Genetic diversity maintained among fragmented populations of a tree undergoing range contraction". Heredity. 121 (4): 304–318. doi:10.1038/s41437-018-0132-8. ISSN 0018-067X. OCLC 888447574. PMC 6134035. PMID 30111882.
- Wang N.; Thomson M.; Bodles W.J.; Crawford R.M.; Hunt H.V.; Featherstone A.W.; Pellicer J.; Buggs R.J. (2013). "Genome sequence of dwarf birch (Betula nana) and cross-species RAD markers". Mol. Ecol. 22 (11): 3098–3111. doi:10.1111/mec.12131. PMID 23167599.
- Trees for Life: Species profile and Reference list
- Flora of North America: Betula nana
- Betula nana Distribution map
- Conservation Genetics and Population History of Betula nana etc., in Svalbard
- Dwarf birch genome website
- Literature arising from the Expedition » Betula nana
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