A few postal authorities from Southeast Asia have issued stamps on Rafflesia i.e. Malaysia, Thailand, Indonesia, Brunei and the Philippines. Below are stamps of Malaysia showing Rafflesia flower. Rafflesia hasseltii is the first Rafflesia species appeared for the very first time on stamp of Malaysia. Malaysia postal authority issued this stamp in 1979. The stamp with the denomination 1c is part of the state definitive stamp set issued for 13 states and a federal territory. Therefore, altogether 14 Rafflesia stamps were released on that issue.
On March 19, 2007, Malaysia postal authority issued a set of stamps to commemorate Vist Malaysia Year 2007. One of the stamps contain a small Rafflesia image (see blow). The Rafflesia species in the stamp is most like R. hasseltii.
On September 2, 2004, Malaysia postal authority issued a set of stamps to commemorate the COP7 Convention on Biological Diversity and MOP1 Cartagena Protocol on Biosafety. One of the stamps shows an image of Rafflesia. I think the Rafflesia species is most like R. cantleyi.
On March 19, 2004, Malaysia postal authority issued a set of stamps to commemorate Commonwealth Country Tourism Ministers' Convention. One of the stamps contains an image of Rafflesia flower. The Rafflesia species identity is unknown.