It's the plural of toñuz. It is the name of a shrub plant that is also called chingoyo or chilca. Its scientific name is Pluchea chingoyo and belongs to the family Asteraceae.
Herbs or shrubs often aromatic
Tonuces means wall or tiny wall
plural of Tonuztonuz (Pluchea chingoyo ) it is a native plant of South America, it is found from Peru to Argentina.