Alnus viridis ssp. sinuata

'Alnus viridis'' ssp. sinuata, commonly known as the Sitka alder', is a subspecies of Alnus viridus''. It is native to western North America in the United States, Canada, and Alaska.

It is a shrub or small tree usually with multiple trunks reaching 8 in (20 cm) in diameter. It grows to heights of about 30 ft (9 m) tall. The leaves are shiny and yellow-green in color, gummy when young.