Scientific name
Corylus cornuta
Also Known As
Filbert
The beaked hazelnut is a deciduous, multi-stemmed shrub. It's namesake is the fruit, which has a husk that surrounds the nut by at least an inch, forming the "beak".

Scientific name
Betula lenta
Leaves ovate in shape and finely toothed. Broken twigs are fragrant with the scent of wintergreen. Bark is dark brown or gray, shiny, and usually not peeling.

Scientific name
Carpinus caroliniana
Also Known As
American hornbeam, Blue beech, Musclewood
Bark of this tree is distinctly smooth and gray. Said to resemble muscles in a well defined human arm or leg. Leaves are double-toothed. Fruits look like little paper lanterns.

Scientific name
Betula papyrifera
Also Known As
Canoe birch, Paperbark birch, Silver birch
Birches have flowers in small clusters (catkins) which hang from the branches and mature before leaves emerge. Paper birch has white, peeling bark but some western varieties can have brown or coppery bark.

Scientific name
Alnus rubra
This common deciduous tree is often found along roadsides and old clearcuts. Its male (staminate) flowers hang in distinctive tassel-like "catkins," and the female flowers look like tiny pinecones.

Scientific name
Alnus serrulata
Also Known As
Common alder, Hazel alder, Smooth alder
A multi-stemmed deciduous shrub with alternate, oval green leaves. Each shrub produces male and female catkins. Female flowers develop into cone-like fruits.

Scientific name
Alnus rhombifolia
Also Known As
California Alder, Sierra Alder
White alder is a fast-growing deciduous tree. The fragrant, light yellow-green leaves have very small, soft hairs on the underside. On young trees, the bark is pale gray and smooth becoming dark and scaly as the tree ages. The flowers are catkins -- with the female catkins resembling very small conifer cones. The fruit is a samara (sometimes called a helicopter or wingnut) that contains a small nut.

Scientific name
Betula alleghaniensis
A tree up to 20 m tall with yellow to bronze, peeling bark. Leaves are elliptical, pointed, with parallel veins and toothed edges. Smells of wintergreen if scratched.