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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