The elder (intsusa) is one of the most cited plants in the writings on traditional medicine in Europe. It is deciduous shrub that can reach a height of between two and seven metres, and whose botanical name is Sanbucus nigra.
The elder has a strong and rather unpleasant smell, and has a trait that is rather unusual in the plant kingdom: its branches have a creamy-white pithy tissue that can removed relatively easily. That leaves a hollow pipe that can be used for different purposes: blowpipes as weapons or to start and stoke fires, a bong or pipe for smoking, or as a flute or whistle. Until relatively recently, youngsters would enjoy making and playing the musical instrument; they would remove the pith from the elder branch, make a hold on the side and cover the other one using cigarette rolling paper. This small flute is known as flota in Elosua (Gipuzkoa) and tulurte in the Larraun Valley (Navarra).