lily of the valley

:  a small plant related to the lilies that has usually two leaves and a stalk of fragrant flowers shaped like bells

1:  an erect low-growing perennial herb of the genus Convallaria (C. majalis) that has two large oblong lanceolate leaves and a raceme of fragrant nodding bell-shaped white flowers and is the source of convallaria, convallamarin, convallarin, and convallatoxin

2:  the dried rhizome and roots of the lily of the valley used as a cardiac tonic