Azolla microphylla
- kingdom: Plantae
- phylum: Tracheophyta
- class: Polypodiopsida
- order: Salviniales
- family: Salviniaceae
- genus: Azolla
- species: Azolla microphylla
São Leopoldo
Rio Grande do Sul- Arraial do Cabo
Rio de Janeiro
Brazil
Revelstoke
British Columbia
Canada- Costa Rica
Jucuarán
Usulután
El Salvador
Munka-Ljungby
Skåne
Sweden
Fruitdale- Grants Pass
- Lake Oswego
Oregon- Saint George
Utah- Sammamish
- White Salmon
Washington
United States
Heredia