Cooked starchy rhizomes in Africa 170 thousand years ago.

Abstract

Plant carbohydrates were undoubtedly consumed in antiquity, yet starchy geophytes were seldom preserved archaeologically. We report evidence for geophyte exploitation by early humans from at least 170,000 years ago. Charred rhizomes from Border Cave, South Africa, were identified to the genus <i>Hypoxis</i> L. by comparing the morphology and anatomy of ancient and modern rhizomes. <i>Hypoxis angustifolia</i> Lam., the likely taxon, proliferates in relatively well-watered areas of sub-Saharan Africa and in Yemen, Arabia. In those areas and possibly farther north during moist periods, <i>Hypoxis</i> rhizomes would have provided reliable and familiar carbohydrate sources for mobile groups.