Siamese balsa
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Gentianales
- family: Apocynaceae
- genus: Alstonia
- species: Alstonia spatulata
Tanjungpati
West Sumatra
Indonesia
Lae
Morobe
Papua New Guinea
Siamese balsa Tanjungpati Lae