Ambrosia microcephala
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Asterales
- family: Asteraceae
- genus: Ambrosia
- species: Ambrosia microcephala
São Luís
Maranhão
Brazil
Cayenne- Rémire-Montjoly
Guyane
French Guiana