^BCannabis plant.^b Man touching the leaves of a cannabis, or hemp, plant (^ICannabis^i ^Isativa^i). This plant is the source of the illegal psychoactive drug marijuana. It is is also cultivated for its tough fibres, which are used in textiles, and its seed oil. It is native to Central Asia, but is now found throughout the world. Despite medicinal applications, its use as a drug is illegal in most countries and therefore a licence is required for its cultivation.