Twiner up to c. 8 m high. Leaves thin-chartaceous, ovate (in outline), 5-13 by 4-6 cm; Inflorescences in the axils of foliage leaves, rarely cauligerous, spiciform, up to 2 cm long, slightly short-hairy; Stamens 6; Capsules ellipsoid, 2.5-3 by 1.5 cm, slightly 6-ridged. Seeds triangular, 4 by 3.5 mm, not winged, granular on both surfaces, central part of the upper surface with a longitudinal ridge.
Asia-Tropical: Sumatera (Sumatera present), Atjeh present, Batu I present, Bencoolen present, Kabandjahe present, Mt Kerintji present, Mt Sinabung present, Pajakumbuh present, Petani Valley present, Sibolangit present, Singgalang present
Malesia: Sumatra (northern part: Atjeh, Mt Sinabung, Kabandjahe, Petani Valley, Sibolangit, Singgalang; central western part: Batu I., Mt Kerintji, Pajakumbuh; southern part: Bencoolen).
The plants of this species are easy to recognize by the rather thin-chartaceous, cordate-sagittate leaves glaucous underneath. According to BROOKS they are the food plant of Papilio helenae CUM.