Section from the 1983 Handbook of Energy Crops covers the uses, description, germplasm, distribution, ecology, cultivation, harvesting, and other aspects of hemp and its production. Includes references.

Image from Köhler's Medicinal Plants.

Image from Botanical Department - University of Catania.

A publication of Southern Illinois University Herbarium by Ernest G. Walker, Jr. on Cannabis sativa, Cannabis indica, and Cannabis ruderalis. With references.

Harvard University Flora Online. Includes description, line drawings, and U.S. distribution map.

By Ernest Small and David Marcus. Reprinted from: Trends in new crops and new uses. 2002. p. 284–326. J. Janick and A. Whipkey (eds.). ASHS Press, Alexandria, VA. One of the best documents about Cannabis on the Web. (PDF file 14.1MB)

Information from the USDA Plants database.

Cannabis sativa L. hemp, Indian hemp.