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It is closely related to the dwarf birch (Betula nana), and is sometimes treated as a subspecies of it, as B. nana subsp. glandulosa. It is distinguished from typical B. nana by the presence of glandular warts on the shoots and longer leaf petioles. Hybrids with several other birches occur. [2]
Betula nigra, the black birch, river birch or water birch, is a species of birch native to the Eastern United States from New Hampshire west to southern Minnesota, and south to northern Florida and west to Texas. It is one of the few heat-tolerant birches in a family of mostly cold-weather trees which do not thrive in USDA Zone 6 and up.
Betula glandulosa (B. nana subsp. glandulosa) - American dwarf birch; Betula nana - Dwarf birch; Tetraploid (4n = 56). Betula minor - Quebec dwarf birch; Betula pumila - Swamp birch; chromosome number not reported. Betula fruticosa-Betula gmelinii-Betula hallii - Cascades dwarf birch; Betula humilis - Arctic dwarf birch; Betula michauxii ...
Betula nana, the dwarf birch, [2] is a species of birch in the family Betulaceae, found mainly in the tundra of the Arctic region. Specimen at 1000m. Description.
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Betula pumila (dwarf birch [2] or bog birch [3]) is a deciduous shrub native to North America. Bog birch occurs over a vast area of northern North America, from Yukon in the west to New England in the east and all the way to Washington and Oregon, inhabiting swamps and riparian zones in the boreal forests.
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At lower altitude is low alpine tundra with continuous plant cover; dwarf birch and willows up to 1 m tall and grasslands, as well as numerous lakes and bogs. At still lower altitude is the adjacent montane birch zone with mountain downy birch (Betula pubescens); some stunted spruce and pine, and many lakes and bogs.
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