Roundleaf Greenbrier (Smilax rotundifolia)

2015-12-31 Bombay Hook NWR, DE
Similar berries might be found with other Smilax species, however, if you look for a roundish leaf, a vine that's green from beginning to end and has thorns with pale tips, the ends of which are black, then you have found Roundleaf Greenbrier berries. For a size perspective, these are resting against two fingers.