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Botany in the Central Market: Coca: High Tea
http://www.ots.duke.edu/en/amigos/51/coca.htm
Article about the use of Erythroxylum spp. in Peru.
Coca Image Vault
http://www.erowid.org/plants/coca/coca_images.shtml
Images of three species of Erythroxylum.
Erythroxylum coca
http://www.botany.hawaii.edu/faculty/carr/erythroxyl.htm
Images.
Erythroxylum: The Coca Plant
http://www.siu.edu/~ebl/leaflets/coca.htm
Description, range, cultivation, and history of use.