callus: (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
plant process: a natural projection or outgrowth from a plant body or organ
cannabidaceae: two genera of erect or twining herbs that are pollinated by the wind, including the genera Cannabis and Humulus; term not used in all classifications; in some the genus Cannabis is placed in the family Moraceae and the genus Humulus in the family Urticaceae