An important early source is the Libellus de medicinalibus Indorum herbis of 1552. Martín de la Cruz, an Aztec physician, wrote it at the College of Santa Cruz in Tlatelolco, and Juan Badiano translated it into Latin. The book contains 185 illustrations of plants. It ended up in the Vatican Library, and Pope John Paul II returned it to Mexico in 1990.
The Florentine Codex of Bernardino de Sahagún, from the sixteenth century, also describes Aztec plants and medicine.
A special source is made of stone. In the mid-nineteenth century a sixteenth-century Aztec statue of Xochipilli, 'flower prince', the god of flowers, song, dance and art, was found on the slope of the Popocatépetl volcano near Tlalmanalco. It is now in the National Museum of Anthropology in Mexico City. Flowers and mushrooms are carved on the statue and its base. Wasson, Schultes and Hofmann recognised sacred mushrooms, tobacco, ololiuqui and sinicuichi in them, and saw in the raised posture someone in ecstasy; not all researchers agree.
Today the University of New Mexico teaches about curanderismo, led by Eliseo Torres.