common blue-eyed grass

Common blue-eyed grass (Sisyrinchium angustifolium), from North America and the West Indies, has been naturalized in parts of Europe. The plant has tall (50-centimetre [20-inch]) flower stems that bear 2-centimetre (about 1-inch) yellow-eyed blooms. Western blue-eyed grass (S. bellum) extends from western Mexico to Oregon…