Report of expedition to collect wild species of potato in Central Peru (departments of Ancash, Huancavelica, La Libertad, Lima).

This report details results of the second of a series o1' five planned collecting expeditions to Peru. The collections reported here were made in the central Peruvian Departments of Ancash, Huancavelica, La Libertad, and Lima, from March 8 to April 25, 1999. They follow collections made in 1998 in tile southern Peruvian departments of Apurimac, Arequipa, Cusco, Moquegua, Puno, and Tacna. That report and a resulting publication in American Journal of Potato Research 76' 103- l 19, 1999, should be consulted lbr additional details not presented here regarding obtaining permission to collect, ecogeographic data, a list and map of Peruvian basionyms for all of Peru, and further details on taxonomy that relates to this report. Because of late rains in 1999, most of our collections were made only as plants in pots and are being increased at CIP in Huancayo, Peru. The goal is to produce true seeds or if not possible to place the plants in-vitro. We made 101 germplasm collections, including first germplasm collections of S. amavanum, S. anamatophilum, S. arahuayum, S. augustii, S. bill-hookeri, S. cantense, S. chavinense, S. chomatophilum var. subnivale, S. chrysoflorum, S. graciliflorum, S. hapalosum, S. huarochirienxe, S. hypacrarthrum, S. jalcae., S. moniliforme, S. multiinterruptum f. longipilosum, S. multiinterruptum var. machaytambinum, S. peloquinianum, S. rhombilanceolatum, S. simplicissimum, S. taulisense, and S. wittmackii. In addition, new collections were made of the under-collected species S. hastiforme (three collections). Some of these names have been synonymy and other names have been newly described or ressurected from prior synonymy in a treatment of the potatoes of Peru by Carlos Ochoa in 1999. We discuss these changes below.