Differs by larger, ovate-to oblong-elliptic leaves, 8-14(-16, rarely up to 20) by (3-)3.5-8(-10, rarely up to 12) cm, which are often dark brown when dry, more coriaceous, variable also in shape.
Reported from the Malay Peninsula to occur both epiphytic in dense jungle and terrestrial in open, swampy or peaty places, also as a woody climber on quartzite ridge, common locally in the Cameron Highlands. In Sumatra, Java, Banka, Borneo and the Philippines a treelet or shrub up to 6 m, or mostly an epiphyte in montane forest, especially in mossy forest, in Sumatra also terrestrial in ridge-forest and in ericoid ridge scrub. Rarely found between 700-1000 m (Java and Borneo), 1000-2500 m, sometimes, as in Sumatra, reaching 3315 m. Fl. Jan.-Dec.
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