Trees and Shrubs of Wabu Woods SNA

Speckled alder (Alnus incana subsp. rugosa)

Shape: Multi-stemmed understory tree
Leaf/Branch Arrangement: Alternate
Flower: Brown/red elongated cluster – catkin, males 1 ¾-3 ½ inches long, females ¼ inch long
Leaves: 1½-4½ inches long, 1-3 inches wide, egg-shaped edges are jagged and coarsely double-toothed
Bark: grayish to reddish brown with pale horizontal lenticels
...more ↓

Yellow birch (Betula alleghaniensis)

Shape: Tree
Leaf/Branch Arrangement: Alternate
Flower: elongated cluster – catkin, male; groups of 1-3, at tips of year old branches, 2 ¼-4 ½ inches long, female, on new lateral twigs, ¾-1 ½ inches long
Leaves: oval with pointed tip, 2-4 ½ inches long, 1 ¼-2 ½ inches wide, double toothed
Bark: yellow, thin, translucent, peeling in ...more ↓

Paper birch (Betula papyrifera)

Shape: Tree
Leaf/Branch Arrangement: Alternate
Flower: Brown/yellow and red elongated cluster – catkin, males 2-3 ¾ inches long, females ½-1 inch long with red styles
Leaves: larger towards base, 2-3½ inches long, 1¼-2 1/3 inches wide, abruptly tapers to sharply pointed tip, base rounded to nearly straight across, edges irregularly ...more ↓

Beaked hazelnut (Corylus cornuta subsp. cornuta)

Shape: Multi-stemmed understory tree
Leaf/Branch Arrangement: Alternate
Flower: Males; yellow/brown elongated cluster – catkin, 3 inches long Female; brown bud, red stiles at tip
Leaves: 2½-4½ inches long, 1¼-3 inches wide, widest above the middle, taper to sharply pointed tip, rounded to somewhat heart-shaped base, edges coarsely ...more ↓

Ironwood (Ostrya virginiana)

Shape: Understory tree
Leaf/Branch Arrangement: Alternate
Flower: elongated cluster – catkin, male; ¾-2 ¼ inches long, red/brown, composed of tightly closed scales, female; 1/8-1/2 inch long, green, nondescript

Leaves: oval, pointed tip, double toothed, finely hairy, 2-5 inches long and 1-2 inches wide
Bark: grey/brown, long ...more ↓

Northern red oak (Quercus rubra)

Shape: Tree
Leaf/Branch Arrangement: Alternate
Flower: males 1 ½-3 inch long string-like cluster, females short, stubby, and green with red styles
Leaves: pinnately lobes, bristle tips at end of lobes, sinuses between lobes indent less than halfway to midvein, 4-8 inches long, 4-5 ½ inches wide
Bark: grey with smooth “ski tracks” ...more ↓

Edited by Minnesota Scientific and Natural Areas, some rights reserved (CC BY-SA)