The bunga mas dan perak (lit. "golden and silver flowers"), often abbreviated to bunga mas (Jawi: بوڠا مس "golden flowers"), was a tribute sent every three years to the king of Ayutthaya (Siam) from its vassal states in the Malay Peninsula, in particular, Terengganu, Kelantan, Kedah, Pattani, Nong Chik, Yala, Rangae, Kubang Pasu and Setul. The tribute consisted of two small trees made of gold and silver, plus costly gifts of weapons, goods and slaves. 
There are several supposed origins of and reasons for the establishment of the tradition:
- 17th-century Kedah rulers considered it to be a token of friendship.
- According to a Kedah legend, a bunga mas was sent as a toy for a Thai prince.
- Thai kings maintained it was a recognition of their suzerainty.
- Cyril Skinner (1983). A Malay Mission to Bangkok during the reign of Rama II, Journal of the Malaysian Branch of the Royal Asiatic Society, 
- Leonard Y. Andaya, Barbara Watson Andaya (1984). A History of Malaysia, ISBN 0312381212, pp.65-68