Taraxacum Dens-leonis

from The Collaborative International Dictionary of English v.0.48

Dandelion \Dan"de*li`on\, n. [F. dent de lion lion's tooth, fr.
   L. dens tooth + leo lion. See {Tooth}, n., and {Lion}.]
   (Bot.)
   A well-known plant of the genus {Taraxacum} ({Taraxacum
   officinale}, formerly called {Taraxacum Dens-leonis} and
   {Leontodos Taraxacum}) bearing large, yellow, compound
   flowers, and deeply notched leaves.
   [1913 Webster]