bog birch Betulaceae Betula nana

Leaf:Alternate, simple, pinnately-veined, broadly obovate to nearly round, 1/2 to 1 inch long, often wider than long; rounded large teeth, thickened, shiny green above and a bit paler below.
Flower:Species is monoecious; preformed male catkins are 1/2 to 1 inch long, pendant, and become much longer and yellow-green as they open in mid-spring; females are upright, 1/2 to 1 inch long, and reddish green in color.
Fruit:Cone-like aggregate of winged nutlets, 1/2 to 1 inch long, upright, ripen in late fall.
Twig:Slender, dark reddish brown, rapidly growing shoots maybe densely hairy, glandular and sticky, but later become smooth; spur shoots numerous; no taste or odor.
Bark:Shiny, reddish brown, numerous horizontal lenticels; larger stems develop dull white markings.
Form:Dense shrub reaching up to 5 feet in height with a round crown in the southern parts of its range. It is much shorter (18 inches) and more prostrate in the northern (Arctic) portions of its range.

leaf flower fruit twig bark form map