About Cynoglossum zeylanicum (Vahl) Thunb. ex Lehm.
Cynoglossum zeylanicum, commonly called Ceylon's hound's tongue, is similar in appearance to Cynoglossum lanceolatum. It differs by having larger flowers that measure 4–5 mm across, and small fruits about 2 mm across. This species is native to Afghanistan, Pakistan, India, Nepal, Sri Lanka, Southeast Asia, China, Taiwan, Japan, and South Korea. It has been introduced to North America, the Caribbean, and South America, and grows at altitudes between 1,200 and 4,100 m.
