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- This is one of several related articles about cannabis. This article deals with the biology of the genus Cannabis. Cannabis (drug) is about marijuana, hashish and related drugs. Hemp is about cultivation for non-drug uses, and the non-drug uses themselves. See also Hemp (disambiguation).
Species
The genus Cannabis was formerly placed with nettles in the family Urticaceae or with mulberries in the family Moraceae, but is now considered along with hops (Humulus sp.) to belong to the family Cannabaceae. All strains of Cannabis can interbreed, which means all known Cannabis plants satisfy the criteria for a single species type called (Cannabis sativa L.).Greg Green. 2005. The Cannabis Breeder’s Bible. Green Candy Press 15-17 However, Cannabis has shown three distinct landrace known as Cannabis sativa, Cannabis indica and Cannabis ruderalis that are geographically isolated. Botanists, especially cannabis specialists, often refer to these three cannabis landrace as separate species or subspecies types. Whether the different strains of Cannabis constitute a single species (Cannabis sativa L.) or multiple species has been a contentious issue for well over two centuries.Emboden, W. A. 1981. The genus Cannabis and the correct use of taxonomic categories. J. Psychoactive Drugs 13: 15–21.Schultes, R. E., and A. Hofmann. 1980. Botany and Chemistry of Hallucinogens. C. C. Thomas, Springfield, IL., pp. 82–116.
Cannabis has three different forms of plant sexuality, with some plants being dioecious, and other plants being hermaphroditic or monoecious.Greg Green. 2003. The Cannabis Grow Bible. Green Candy Press 99-110 It is traditionally (albeit contentiously) divided into at least five subspecies, indica/sativa, pure indica, pure sativa, mostly sativa and mostly indica, each found as a cultivar and a wild variety.Greg Green. 2005. The Cannabis Breeder’s Bible. Green Candy Press 14Small, E., and A. Cronquist. 1976. A practical and natural taxonomy for Cannabis. Taxon 25: 405–435. Cannabis sativa male plants show evidence of selection for traits that enhance fiber production and seed-oil (for fuel) but the female plant produce seeds (for food) and flower buds that can be used as a psychoactive substance because it has higher levels of the psychoactive delta-9-tetrahydrocannabinol (THC), whereas Cannabis indica was primarily selected for drug production and has relatively higher levels of cannabidiol (CBD) and Cannabinol (CBN) than THC.
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