This article is about the plant genus. The number of species within the genus is disputed. Industrial hemp products are made glossary of plant breeding and genetics pdf cannabis plants selected to produce an abundance of fiber.
In 2014 there were an estimated 182. This percentage has not changed significantly between 1998 and 2014. At the top of a flowering plant, this number again diminishes to a single leaflet per leaf. As is common in serrated leaves, each serration has a central vein extending to its tip. However, the serration vein originates from lower down the central vein of the leaflet, typically opposite to the position of, not the first notch down, but the next notch. This means that on its way from the midrib of the leaflet to the point of the serration, the vein serving the tip of the serration passes close by the intervening notch.
The plant is believed to have originated in the mountainous regions northwest of the Himalayas. It is not unusual, however, for individual plants to bear both male and female flowers. 2011 by a team of Canadian scientists. 85 different cannabinoids have been isolated from the plant.
THC produced, and on the ratio of THC to CBD. CBD ratio is genetically determined and remains fixed throughout the life of a plant. Non-drug plants produce relatively low levels of THC and high levels of CBD, while drug plants produce high levels of THC and low levels of CBD. Female plants of this chemotype may produce enough THC to be utilized for drug production. One widely applied criterion for species recognition is that species are “groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups.