Viburnum trilobum (V. opulus var. americanum, V. opulus ssp. trilobum)
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:
||V. o. var. opulus
||V. o. var. americanum
|| 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).