1905, Maude Gridley Peterson,How to Know Wild Fruits: A Guide to Plants When Not in Flower by Means of Fruit and Leaf[1], Macmillan, page202:
Black crowberry. Empetrum nigrum. Crowberry Family.Fruit. — The blackdrupe is berrylike, globular, and incloses six to nine seedlike nutlets with a seed in each. The calyx is at the base and the stigma is at the apex. Thedrupes are solitary in the leaf axils. They are juicy, acid, edible, and serve as food for the Arctic birds.
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