blue-eyed grass

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

• noun Any of various perennial herbs of the genus Sisyrinchium native to the Americas, having grasslike leaves and small blue, white, or yellow flowers.

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) a grasslike plant (Sisyrinchium anceps), with small flowers of a delicate blue color.

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

• noun plant with grasslike foliage and delicate blue flowers