Petunia riograndensis
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Solanales
- family: Solanaceae
- genus: Petunia
- species: Petunia riograndensis
Canguçu- Caçapava do Sul
- Herval
- Pinheiro Machado
Rio Grande do Sul
Brazil