During the course of the survey undertaken by the Rubber Development Corporation of the United States Government in the spring of 1943, under the field direction of the writer, the source of highland chilte was discovered to be an undescribed species of Cnidoscolus.
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Lundell, Cyrus Longworth
"Cnidoscolus elasticus, The Source Of Highland Chilte, A Remarkable New Rubber Yielding Tree From The States Of Durango And Sinaloa, Mexico,"
Field and Laboratory: Vol. 12
Available at: https://scholar.smu.edu/fieldandlab/vol12/iss2/1