or Lily of the Valley, in botany, a genus of the monogynia order, belonging to the hexandria clas of plants; and in the natural method ranking under Sarmentaceae, or 11th order. The corolla is sextid; the berry spotted and trilocular. The species are eight, three of which are natives of Britain, viz. the marjoram, or may-lily; the multiflora, or Solomon's-seal; and the polygonatum, or sweet-smelling Solomon's-seal. They are plants of considerable beauty, and may easily be propagated by their creeping roots.