Contents

08 February 2019
Vol 363, Issue 6427

About The Cover

Cover image expansion

COVER For thousands of years, Andean farmers have cultivated colorful landraces of domesticated potatoes, such as lioness, tunica, and tarmeña shown in this arrangement. Landraces and wild species hold genetic diversity that could be key to developing new potato varieties, which are needed to help farmers adapt to climate change and other challenges. See page 574.
Photo: Gustavo Ramirez