Several times a week, I drive past this plant whose dark, round clusters of fruit stand out in the snowy landscape. Up close, this plant is recognized as a branching herbaceous vine, bearing tendrils and a few withered simple leaves. This is Carrion-flower (Smilax herbacea), a prinkle-free, non-woody relative of the heavily armed, woody stemmed Common Greenbrier (S. rotundifolia).
Carrion-flower's fruits are born in umbels, which are composed of short stalks radiating from a central point (the nearly fruitless example below provides a look at the umbel's structure). Note the location of plants you find in the white season, and you can return in the spring to observe the new green growth. In fact, you may want to sample the rapidly growing tips of this plant, which are edible both raw and cooked.