Chelone glabra (Turtlehead, Bitter Herb, Codhead, Fish Mouth, Shellflower, Snakehead, Snake Mouth, Turtle Bloom)
Chelone glabra, most often referred to as Turtlehead because the blooms resemble the heads of turtles, is native to the stream banks and moist ground of the eastern half of the United States. Chelone glabra white, though often tinged with pink, and grows from two to three feet tall in full sun to partial shade. Zones 4-8. Quarts. (Photo by Tom Barnes, University of Kentucky, and used with his permission).