Erythroxylum havanensis
- Description and photograph of this species endemic to Cuba.
- http://www.cybertruffle.org.uk/vinales/eng/erythroxylum_havanensis.htm

Erythroxylum areolatum
- Description of this plant with photographs of leaves, shoots and fruit.
- http://www.cybertruffle.org.uk/vinales/eng/erythroxylum_areolatum.htm

Erythroxylum areolatum - False Cocaine
- Detailed drawing and botanical information for this shrub native to the Caribbean, southern Mexico, and Central America.
- http://www.fs.fed.us/global/iitf/pdf/shrubs/Erythroxylum%20areolatum.pdf

Erythroxylum: The Coca Plant
- Description, range, cultivation, and history of use.
- http://www.siu.edu/~ebl/leaflets/coca.htm

Coca Image Vault
- Images of three species of Erythroxylum.
- http://www.erowid.org/plants/coca/coca_images.shtml

Erythroxylum coca
- Images.
- http://www.botany.hawaii.edu/faculty/carr/erythroxyl.htm

Botany in the Central Market: Coca: High Tea
- Article about the use of Erythroxylum spp. in Peru.
- http://www.ots.duke.edu/en/amigos/51/coca.htm