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tlatzilacayotli.

Headword: 
tlatzilacayotli.
Principal English Translation: 

a medicinal herb with round leaves and a white flower, said to be effective for treating venereal disease

The Mexican Treasury: The Writings of Dr. Francisco Hernández, ed. Simon Varey, transl. Rafael Chabrán, Cynthia L. Chamberlin, and Simon Varey (Stanford: Stanford University Press, 2000), 142.

Attestations from sources in English: 

Curiously, this herb is said to have the potential to "cause some terrible accidents," and it was recommended that the patient have a steam bath (temazcalli) after the herbal purge.
The Mexican Treasury: The Writings of Dr. Francisco Hernández, ed. Simon Varey, transl. Rafael Chabrán, Cynthia L. Chamberlin, and Simon Varey (Stanford: Stanford University Press, 2000), 142.

themes: 
Flowers
Plants, Trees, Flora