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Cannabis also has a long history of being used for medicinal purposes, and as a recreational drug known by several slang terms, such as marijuana, pot or weed. Various cannabis strains have been bred, often selectively to produce high or low levels of tetrahydrocannabinol (THC), a cannabinoid and the plant's principal psychoactive constituent .
The leaves of specifically the Leonotis leonurus resemble the cannabis leaf and is known locally as wild dagga. [1] The word has been spelled many different ways over time as various groups of people began using the term and some examples of these are: daggha, dacha, dacka, dagha, tagga, dachka, daga .
When so used, preparations of flowers and fruits (called marijuana) and leaves and preparations derived from resinous extract (e.g., hashish) are consumed by smoking, vaporising, and oral ingestion. Historically, tinctures, teas, and ointments have also been common preparations.
The reddish stems of this herbaceous perennial are usually simple, erect, smooth, 0.5–2 metres (1 + 1 ⁄ 2 – 6 + 1 ⁄ 2 feet) high with scattered alternate leaves. [2] The leaves are spirally arranged, entire, narrowly lanceolate, and pinnately veined, the secondary leaf veins anastomosing, joining together to form a continuous marginal vein just inside the leaf margins. [3]:
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Septoria cannabis is a species of plant pathogen from the genus Septoria that causes the disease commonly known as Septoria leaf spot. Early symptoms of infection are concentric white lesions on the vegetative leaves of cannabis plants, followed by chlorosis and necrosis of the leaf until it is ultimately overcome by disease and all living cells are then killed.