yoyotli.

Headword: 
yoyotli.
Principal English Translation: 

a small tree something like an oleander (Thevetia thevetioides)

Joie Davidow, Infusions of Healing: A Treasury of Mexican-American Herbal Remedies (Simon & Schuster, 1999), 81.

Alonso de Molina: 

yoyotli. caxcauel de arbol.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 39v. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

Daniel Garrison Brinton says Aztec copper bells were tzilinilli, but other names for them were coyolli and yoyotli.
Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 25.

themes: 
Plants, Trees, Flora