Betula nana


Betula nana
Dwarf Birch
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fagales
Family: Betulaceae
Genus: Betula
Subgenus: Chamaebetula
Species: B. nana
Binomial name
Betula nana
L.

Betula nana (Dwarf Birch) is a species of birch in the family Betulaceae, found mainly in the tundra of the Arctic region.

Contents

Description

Diapensia lapponica with a branch of dwarf birch, Nunavut, July 1996

It is a shrub growing to 1-1.2 m high. The bark is non-peeling and shiny red-copper colored.[1] The leaves are rounded, 6-20 mm diameter, with a bluntly toothed margin. They become red in the autumn. The fruiting catkins are erect, 5-15 mm long and 4-10 mm broad.

Distribution

B. nana is native to arctic and cool temperate regions of northern Europe, northern Asia and northern North America and it will grow in a variety of conditions.It can be found in Greenland. Outside of far northern areas, it is usually found only growing in mountains above 300 m, up to 835 m in Scotland and 2200 m in the Alps. Its eastern range limit is on Svalbard, where it is confined to warm sites.

Ecology

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 only with scattered hairs, but coated in resin; leaves shorter (not over 12 mm long), often broader than long.

References

  1. ^ Ewing, Susan. The Great Alaska Nature Factbook. Portland: Alaska Northwest Books, 1996.

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Look at other dictionaries:

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  • Betula nana — Zwerg Birke Zwerg Birke (Betula nana) Systematik Klasse: Dreifurchenpollen Zweikeimblättrige (Rosopsida) …   Deutsch Wikipedia

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  • Betula nana — ID 9964 Symbol Key BENA Common Name dwarf birch Family Betulaceae Category Dicot Division Magnoliophyta US Nativity Native to U.S. US/NA Plant Yes State Distribution AK, CA, CO, ID, ME, MN, MT, NH, NY, OR, SD, UT, VT, WA, WY Growth Habit Subshrub …   USDA Plant Characteristics

  • Betula nana L. — рис. 10 куст.; V–VI Сем. Betulaceae – Березовые 84. Род Betula L. – Береза 194. Береза карликовая Верховые болота, заболоченные еловые леса. Очень редко. Указана для кв. 55/56 (Флеров, 1935б; Трофимов, 1950) (в 1974 г. найдена там же Л. С.… …   Флора Центрально-лесного государственного заповедника

  • Betula nana — …   Википедия

  • Betula nana — Dværgbirk …   Danske encyklopædi

  • Betula nana L. — Symbol BENA Common Name dwarf birch Botanical Family Betulaceae …   Scientific plant list

  • Betula nana ssp. exilis — ID 9965 Symbol Key BENAE Common Name N/A Family Betulaceae Category Dicot Division Magnoliophyta US Nativity Native to U.S. US/NA Plant Yes State Distribution AK Growth Habit Shrub, Subshrub Durati …   USDA Plant Characteristics