Source : Webster's Revised Unabridged Dictionary (1913)

Leadwort \Lead"wort`\, n. (Bot.)
   A genus of maritime herbs ({Plumbago}). {P. Europ[ae]a} has
   lead-colored spots on the leaves, and nearly lead-colored
   flowers.

Source : WordNet®

leadwort
     n : plant with lead-blue flowers [syn: {Plumbago europaea}]