ACKNOWLEDGEMENTS This  work,  started  in  1970,  is  based  on  published  data,  examination  of  herbarium  and  live specimens  in  Perú  and  the  United  States,  and  trips  by  two  of  the  authors  in  all  the  watersheds described for Perú. A large part of the work was done during the sabbatical year of the senior author at the University of California at Davis in 1974-75. Acknowledgements are due to innumerable persons and institutions -- only a few can be mentioned here. In Peru: Dr. Ramón Ferreyra, Museo Historia Natural Javier Prado, Universidad Nacional Mayor de San Marcos, Lima, Perú. Ing. Carlos Ochoa, Profesor Principal, Universidad Nacional Agraria, La Molina, Perú. Dr. Julio López Guillen and J. Soukup, Herbario, Instituto de Recursos Naturales, Programa Academico de Farmacia, Universidad Nacional Mayor de San Marcos, Lima, Perú.   Dr. Abundio Sagastegui, Herbario Truxillensis, Universidad Nacional de Trujillo, Trujillo, Perú. In the United States: Dr. Elizabeth McClintock, California Academy of Sciences, San Francisco, California. Dr. William D'Arcy, Missouri Botanical Garden, St. Louis, Missouri. Dr. Johnnie Gentry, Oklahoma State University, Stillwater, Oklahoma (formerly Field Museum of Natural History, Chicago, Illinois). Dr. Lincoln Constance, University of California, Berkeley, California. Special thanks are due the Guggenheim Foundation for financial support during the senior author's fellowship when the bulk of the data was collected and organized. I. OBSERVATIONS FROM COLLECTORS' DATA SUMMARIZED BY SPECIES The information recorded here was found on labels of herbarium sheets, in notebooks of CMR, and from personal recollections of the sites where specimens were found. All the data from one site have been treated as a single observation and have been tabulated for each watershed. A site is designated by the name or position of a geographic point where the collection or accession was found. The sites for each watershed are listed in Tables 5 - 44. The correctness of reported altitudes has not been confirmed. Ecological  conditions  of  the  site  are  approximated  from  the  collection  data  and  known  soil characteristics.  Habitat  preferences  and  relative  abundance  are  also  indicated  by  notations  on  the species  association  and  population  size.  Seed  data  as  tabulated  permit  estimates  of  the  age  of  the plant. The time of collection correlates stage of growth with moisture conditions in the area. Such data can be analyzed further in future comparisons with yearly moisture records, especially for watersheds that  have  a  short  season  of  available  moisture  and  for  the  species  L.  peruvianum,  L.  chilense,  and Solanum pennellii which are found in dry washes that are very erratic in water supply. Appearance in "loma" situations also indicate conditions that favor such plant formations and can be correlated with available weather records for nearby watersheds. The loma formation is typical of the western coast of South America from northern Peru to central Chile. The plants growing there are supported by water condensed  from  coastal  fogs.  The  altitudes  recorded  here  can  be  related  to  the  plant  formations  in Weberbauer's classification for Peru. a.  L.  hirsutum  (Table  1).  The  area  of  distribution  is  divided  into  four  main  regions.  Considering  the western  slopes  of  the  Andes,  we  agree  with  Weberbauer's  view  that  the  Jequetepeque  River marks  an  important  north-south  transitional  zone.  Starting  from  the  north,  there  are  three areas on the western slope and one on the eastern. 1. The Chira-Jequetepeque region.

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