Buffaloberry is the small, glossy scarlet berry — sometimes golden-orange — that ripens in dense, tightly packed clusters along the thorny branches of a silvery-leaved shrub of the Great Plains and northern Rockies. Sharply sour and astringent when raw, high in the foaming saponins that let it be whipped into a frothy pink "Indian ice cream," it is one of the historically important wild fruits of the Plains peoples and is foraged for jellies, sauces and drinks far more often than it is eaten out of hand.