Cannabis sativa L.
Common Name: HEMP, MARIJUANA
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad A-Forb

Cannabis sativa B. S. Walters

Surreptitiously cultivated, but spontaneous in many situations: roadsides, farmyards, vacant lots, old fields, stream banks; thrives on muck soils. Long established as a weed in disturbed places (collected as early as 1837 by the First Survey). A native of Asia, this complex species has been cultivated since antiquity for the fiber, derived from the stem much as flax and used in ropes, nets, sailcloth, etc. Cultivation as a fiber plant and for the oil in the seeds has been encouraged as recently as World War II, and most wild plants represent escapes.

The species is also known as a drug plant, long used in Asia (source of bhang, hashish) and also used elsewhere as a non-addictive stimulant. More recently becoming utilized medicinally for chronic pain and nausea. The resin of the plant, exuded especially in the pistillate inflorescences, is the source of the active principle. The strains cultivated for fiber are not the same as those particularly cherished for drug use. Growing of Cannabis is under strict federal control but, like any weed, C. sativa is difficult to eradicate by legislation.

Locations

Allegan County
Barry County
Berrien County
Cass County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Emmet County
Ingham County
Isabella County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
Lapeer County
Leelanau County
Lenawee County
Livingston County
Macomb County
Muskegon County
Oakland County
Ottawa County
St. Clair County
St. Joseph County
Van Buren County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 12, 2017. http://michiganflora.net/species.aspx?id=711.