Looking at my guide, there are three species in question here. Cranberry viburnum (V. trilobum), Guelder-rose/European highbush cranberry (V. opulus) and Squashberry (V. edule). Squashberry is described as a “Northern straggling shrub” that makes excellent jam. That fit’s @don1357 's description. For the cranberries, the Euro species is similar to trilobum, but “glands of leafstalks concave on top; leaf lobes less long-pointed. Stipules more slender and pointed and fruits more bitter.” From Peterson Guide to Trees and Shrubs for NE US and SE Canada.
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