thinleaf alder Betulaceae Alnus incana ssp. tenuifolia
Leaf:Alternate, simple, oval, doubly serrated, 2 to 4 inches long, dull dark green above, paler with slight pubescence below, obviously thin.
Flower:Species is monoecious; in small clusters, preformed male catkins are 1/2 to 1 inch long, slender and green; females are much smaller, reddish green, open in early spring.
Fruit:Cone-like, 1/2 inch long, brown when ripe, each scale enclosing a very small winged seed, mature in late summer, and persistent.
Twig:Moderate, gray-brown to reddish brown, velvety, lighter lenticels, buds stalked, plump and reddish brown.
Bark:Smooth gray-green to reddish brown with numerous conspicuous horizontal white to light orange lenticels, becoming scaly on old trees.
Form:A thicket-forming suckering shrub or small tree that reaches 25 feet in height, and may reach 40 feet.