Rafflesia manillana is classified as Endangered (EN) on the 1997 IUCN Red List of Threatened Plants (1). R. keithii and R. pricei are classified as Vulnerable (VU); R. cantleyi, R. kerrii and R. zollingeriana are classified as Rare (R) (1); R. hasseltii is classified as Indeterminate (I) (1).