commonly called the "cacao" flower (botanical name: Quararibea funebris), but this is not botanically related to the cacao tree, it is an herb used in making the beverage called tejate; it also has medicinal value (see attestations)
"cacao" flower (late sixteenth century, Tetzcoco?)
"The cacahoaxóchitl or cacaoatl flower is an herb that has heart-shaped leaves, stems a span long, purple flowers and thick, fibrous roots. The root is sweet, with a trace of bitterness, enough to make it hot. Half an ounce powdered and taken, cures dysentery. (It grows in Yancuitlan, in Upper Mixteca.)"