Lily of the valley (Convallaria majalis) is a shade-loving perennial with bell-shaped flowers that makes a good ground cover. But it can be invasive.
Lily of the Valley - Flowers - Featured Content - Lovingly
Lily of the Valley Grow and Care Guide - Gardening
Convallaria majalis 'Pink' (Lily of the Valley) – Vermont Wildflower Farm
Convallaria montana (American Lily of the Valley) - World of Flowering Plants
Lily Flower - Flowers Names
How to Grow and Care for Lily of the Valley
Lily of the Valley Grow and Care Guide - Gardening
Can you pick the lily of the Valley? - Quora
All About Lily of the Valley