Lapsana communis.

Botanical name: 

Lapsana communis Linn. Compositae. Nipplewort.

Europe, Orient, northern Asia and naturalized in America. The young leaves in the spring have the taste of radishes and are eaten at Constantinople as a salad. In some parts of England, the common people boil them as greens, but they have a bitter and not agreeable taste.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.