Iris tectorum

Native to China, this rhizomatous perennial forms spreading clumps of sword-shaped leaves. Its beardless flowers are purple to blue-purple, with a fringed white crest on the three spreading outer segments; white-flowered forms also occur. It flowers in spring and is cultivated in borders, near ponds and in water gardens. Established clumps can be divided to produce new plants. Its rhizomes are poisonous if eaten, and the sap can irritate skin. Photographed in Panama.