Viburnum trilobum (American Cranberrybush Viburnum, American Cranberrybush, Kalyna or Highbush or High Bush Cranberry) is a species of Viburnum native to northern North America, from Newfoundland west to British Columbia, south to Washington state and east to northern Virginia, with an isolated population in New Mexico. It is very closely related to the European and Asian Viburnum opulus, and is often treated as a variety of it, as Viburnum opulus L. var. americanum Ait., or as a subspecies, Viburnum opulus subsp. trilobum (Marshall) Clausen.
It is a deciduous shrub growing to 4 m tall. The bark is gray and rough and has a scaly texture. The stems arch and are very dense, and the twigs are a reddish-brown color. The leaves are opposite, three-lobed, 6-12 cm long and 5-10 cm broad, with a rounded base and serrated margins; they are superficially similar to many maple leaves, most easily distinguished by their somewhat wrinkled surface with impressed leaf venation. The leaf buds are green. The bud scales are valvate. The flowers are white, produced in corymbs up to 13 cm diameter at the top of the stems; each corymb comprises a ring of outer sterile flowers 2-2.5 cm diameter with conspicuous petals, surrounding a center of small (5 mm), fertile flowers; the flowers are pollinated by insects. The fruit is an oblong red drupe 15 mm long and 12 mm broad, containing a single flat, white seed. Plants begin to produce fruit at approximately five years of age; when animals, including birds, eat the fruits, they deposit the seeds in another location in their droppings.
Although often called "Highbush Cranberry", it is not a cranberry. The name comes from the red fruits which look superficially like cranberries, and have a similar flavor and ripen at the same time of year. The fruits, sour and rich in vitamin C, can be eaten raw or cooked into a sauce to serve with meat or game.
The larvae and adults of the Viburnum leaf beetle feed on the leaves and may completely defoliate the plant, and repeated damage can kill it.
This is a commonly used berry in Western Canadian cultures. Peoples of various origins both Native and European have used the berries for many years.
The Canadian French name for the berries is Pembina. The name Pembina was then applied to two rivers, one in Manitoba and North Dakota, and one in Alberta, and from the rivers the named was applied to several other places and institutions.