horse gentian

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

• noun Any of several North American and East Asian plants of the genus Triosteum of the family Caprifoliaceae, having opposite leaves, small purplish-brown flowers, and usually orange-yellow fruit.

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

• noun coarse weedy American perennial herb with large usually perfoliate leaves and purple or dull red flowers