twinberry

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A shrubby honeysuckle (Lonicera involucrata) chiefly of western North America, having paired tubular yellow flowers and shiny purple-black berries.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A North American species of honeysuckle, Lonicera involucrata.
• noun Its fruit, a bitter edible black berry containing several small seeds.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries
• noun shrubby honeysuckle with purple flowers; western North America