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tubercles (Solanum tuberosum L.) for their acclimatation in Russia, and makes, in
passing, an extensive herborization that is conserved in the Botanical Gardens
of Leningrad; Carlos Schunke, old inhabitant of the valley of La Merced in the
department of Junín, collects around 1500 species in the valley of Chanchamayo
(P M); and Adolfo Diehl obtains, equally, another appreciable lot in the valley
of Urubamba of the department of Cuzco.

In 1929, under the auspices of the National Museum of the United States,
botanists Ellsworth P. Killip and Albert C. Smith, realize, during the months of
April to October, a very important exploration through the region of East Peru.
Passing through Tarma and Huancayo they penetrate the province of Huanta of the
Department of Avácucho, visiting the margins of the Apurímac, they explore then
the valley of Chanchamayo, stopping in San Román, La Merced and the Colony of
the Perené and descending along the Pichie River and by way of Pachitea and
Ucayali they reach the city of Iquitos. From here they undertake the exploration
of the Huallaga to the port of Yurimaguas and finally the Itaya River Basin. In
the undertaking they collect more than 8000 plants (U S, N I, F M), giving partic-
ular attention to the species used as stupefiers. Both botanists with authors
of an ample bibliography on the flora of Eastern Peru were the first to introduce
the technical names of the CUBE, AYAHUASCO and others whose use were already
known by the natives.

Also in 1919, Prof. Llewlyn Williams, conservator of the Department of
Economical Botany of the Field Museum of Natural History of Chicago, explores
for said institution the northeast region of Peru. Making the city of Iquitos
the center of his excursions, he travels along the banks of the Marañón, the
Amazon, the Huallaga, etc., obtaining around 8200 specimens, many of them in
duplicate forms and an addition of 2154 specimens of precious woods and diverse
objects (F M); Miss Inés Mexia, in behalf of the University of California,
herborizes first in the department of Loreto and finally along the South American
Andes.