Buxus sempervirens.

Botanical name: 

Buxus sempervirens Linn. Euphorbiaceae. Box.

Europe, Orient and temperate Asia. In France and some other parts of the continent, the leaves of the box have been used as a substitute for hops in beer, but Johnson says they cannot be wholesome and would probably prove very injurious.

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