Distribution and habitat
Rafflesia balatociana is known currently only from the south-western Kalinga Province, in the tropical upper montane forests of the Cordillera Central, Luzon Island (Figs. 4A‒D ). It occurs in mossy forests at an elevation of ca.1750–1800 m near Mt. Alimungao. The host Tetrastigma species (refer to Fig. 4L ), could not be identified with certainty (taxonomic limits in the genus are unresolved), and due to restrictions in accessibility, specimens could not be collected or deposited.