Bindwed or Bindweed: How To spell?

The word Bindwed is misspelled against Bindweed, a noun meaning "A plant of the genus Convolvulus; as, greater bindweed (C. Sepium); lesser bindweed (C. arvensis); the white, the blue, the Syrian, bindweed. The black bryony, or Tamus, is called black bindweed, and the Smilax aspera, rough bindweed."