Source: Spruce, R. (1908) IN: Wallace, A. ed. Notes of a botanist on the Amazon & Andes, p 448 : Another powerful nervous tonic and sub-narcotic is cupana or guarana, which is prepared from the seed of a twining plant of the family of Sapindacaceae. The I, ndians scrape the seeds, mix them with flour of cassava envelop the mass in plantain leaves and set it to ferment in water till it acquires a saffron- yellow colour. This yellow paste dried in the sun and diluted in water is taken in morning as kind ofte, a. [Considered] a preservative against the malignant bilious fevers which are the scourge of that region.
Determinations:
51.01 SAPINDACEAE Paullinia cupana H.B. & K.  51.01 SAPINDACEAE Paullinia nobilis Mart.