American Cranberry Viburnum         vi-BER-num tri-LO-bum

• Broadleaf deciduous shrub, 8-12 ft (2.1-3.5 m) high with a similar spread, upright, spreading, round topped, arching branches.  Leaves simple, opposite, 3-lobed, 5-14 cm long, base rounded or truncate, lobes acuminate, sometimes middle lobe elongated, margin coarsely toothed, dark green above, soft hairs on veins below, petiole 13-25 mm long, with shallow grove, usually with sticky glands.  Fall color ranges from yellow to red-purple.  Flowers white, in 10 cm flat-topped clusters (cymes), those in the outer ring are 2 cm across, showy and sterile; the inner ones are inconspicuous, with yellow anthers.   Fruit is 9 mm diam, scarlet red in fall.  (Similar to V. opulus).
• Sun to part shade, best in good, well-drained, moist soil.
• Hardy to USDA Zone 2      Native range from New Brunswick to British Columbia, south to New York, Michigan, South Dakota and Wyoming.
• Viburnum trilobum is now most often considered a variety (varietas, var.) of Viburnum opulus (syn. Viburnum opulus var. opulus), the European Cranberry Viburnum, and designated Viburnum opulus var. americanum.  Regardless of their names, the two can easily be confused.  Below are a few differences gleaned from the literature:

Item	V. o. var. opulus	V. o. var. americanum (V. trilobum)	Author
Petiole	narrow grove and large disc-like   glands	shallow grove with small   glands	Rehder, 1940
Leaf pubescence     (use a microscope)	usually present on lower leaf   surfaces	usually lacking, except on   veins	Cope, 2001



• Oregon State Univ. campus: northeast corner of parking lot across from McNary dorm. on Jefferson (compare to adjacent Viburnum opulus).