Betula pumila |
Betula pendula |
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bog birch, dwarf birch, swamp birch |
European weeping birch |
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Habit | Monoecious, deciduous trees to 25 m., trunks usually several, the crowns spreading; bark of mature trees creamy to silvery-white, smooth, peeling in long strips; lenticels dark; branches pendulous, twigs glabrous, dotted with small, resinous glands. | |
Leaves | Leaf blades broadly ovate to rhombic, 3-7 cm. long and 2.5-5 cm. wide, the base wedge-shaped, the margins sharply double serrate, the tip acuminate, surfaces glabrous to sparsely pubescent. |
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Flowers | Staminate catkins 3 per scale, pendulous; pistillate catkins 3 per scale, erect, cylindric, 2-3.5 cm. long, the scales 3-lobed, the lateral lobes broad and rounded, much longer that the central lobe. |
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Fruits | Samaras with wings much broader than bodies, broadest in the center. |
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Betula pumila |
Betula pendula |
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Flowering time | April-June | April-May |
Habitat | Wet places, often in swamps and bogs. | Disturbed areas associated with urban and suburban development where the trees escape from cultivation. |
Distribution | Occurring chiefly west of the Cascades crest in Washington; Yukon Territory to Oregon, east to northern Idaho and western Montana, east to the Atlantic.
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Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to Oregon; also in northeastern North America.
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Origin | Native | Introduced from Eurasia |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Web links |
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