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Cannabis sativa var. indica

Interesting Facts

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Description

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Family Cannabaceae

Herbs, annual or perennial , erect or twining , dioecious or sometimes monoecious, often with cystoliths (a hard calcium carbonate structure at base of a hair) . Stems furrowed or winged . Stipules free . Leaves alternate or opposite, palmately lobed or compound , sometimes simple . Male inflorescences a bracteate cymose panicle. Male flowers: pedicellate ; sepals 5, free; petals absent; stamens 5, opposite sepals; filaments short; anthers 2-loculed, dehiscent by longitudinal slits. Female inflorescences a bracteate spicate cyme much reduced in Cannabis, pendent or erect. Female flowers: sessile; calyx appressed to ovary, membranous; petals absent; ovary 1-loculed; ovule solitary, pendulous from locule apex; style 2-parted, branches filiform . Fruit an achene, covered by persistent calyx; endosperm fleshy ; embryo curved or spirally involute .

Two genera and four species: N Africa, Asia, Europe, North America; two genera and four species (one endemic) in China.

Because all the Chinese species in this family are cultivated and are often found naturalized in disturbed habitats , it is difficult to know the true wild distributions.

Cannabaceae has sometimes been included in Moraceae or Urticaceae but is now usually recognized as a distinct family. The subfamily Celtidoideae of Ulmaceae could possibly be included within Cannabaceae (see the discussion after the Ulmaceae family description ) .[1]

Genus Cannabis

Herbs, annual , erect , taprooted. Stems simple to well branched, without 2-branched hairs . Leaves palmately compound ; petiole not twining , without 2-branched hairs. Leaf blade : surfaces abaxially sparsely to densely pubescent . Inflorescences: staminate inflorescences compound cymes or panicles, erect; pistillate pseudospikes, congested , erect to spreading . Flowers: staminate and pistillate on different plants , sometimes on same plants, especially in cultivars. Achenes lenticular , enclosed within enlarged perianth; embryo curved . x = 10.

Species 1: widespread in temperate regions , nearly worldwide.

Many populations of Cannabis sativa have been established largely from escapes from former cultivation and, sporadically, from clandestine cultivation.

One of the oldest cultivated plants , hemp was widely used in Neolithic China in the Yang Shao culture (ca. 4000 B .C.). Many legends understandably surround its origins and popularity. Its tough and durable fiber, excellent for rope, cordage, paper, canvas, sailcloth, and fish nets , prompted its initial spread throughout the world. The seeds are very nutritious; they are an important constituent in birdseed mixes, and the seeds, as well as the edible oil from seeds, are marketed as an excellent food source for human consumption . Oil from the seeds was also used in paints and varnishes and as fuel for lamps (B. B. Simpson and M. Conner-Ogorzaly 1986). Hemp was a major economic crop in the American colonies because of the demand for rope in agricultural, maritime, and military pursuits. Probably best known today for its psychoactive chemicals, it is used legally by physicians in the treatment of glaucoma and to relieve nausea in cancer patients undergoing chemotherapy or radiation (B. B. Simpson and M. Conner-Ogorzaly 1986).

Until 1970 marihuana was legally controlled in the United States by the Marihuana Tax Act of 1937, which levied a transfer tax for which no stamps or licenses were available to private citizens. Cannabis is now controlled by the Comprehensive Drug Abuse Act of 1970. In Canada marihuana has been controlled since 1938 by an amendment to the Narcotic Control Act (D. E. Mustol 1991).

The vernacular name hemp refers both to the plant and to its commercially extracted bast fibers. Most other terms refer both to the plant and to drug preparations of it.[2]

Taxonomy

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Similar Species

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Members of the genus Cannabis

ZipcodeZoo has pages for 6 species, subspecies, varieties, forms, and cultivars in this genus:

C. sativa (Grass) · C. sativa indica (Grass) · C. sativa sativa (Marijuana) · C. sativa spontanea var. spontanea (Marijuana) · C. sativa var. sativa (Marijuana) · C. sativa subsp. indica (Mary Jane)

More Info

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Further Reading

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Notes

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Contributors

Identifiers

Footnotes

  1. Zhengyi Wu, Zhe-Kun Zhou & Bruce Bartholomew "Cannabaceae". in Flora of China Vol. 5 Page 74. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Cannabis". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]
Last Revised: 2012-07-28