Aristolochia praevenosa F.Muell.

Robust vine; stems to 12 m long; young branches ferruginous puberulent, glabrescent. Leaves: petiole 0.8–3.9 cm long; lamina ovate or oblong-elliptic to elliptic-obovate, (4.5–) 6.5–23 (–27) cm long, (1.4–) 2.5–11.6 cm wide, ± glabrous above, pubescent mainly on veins below; base subcordate to cordate or slightly oblique; apex bluntly acuminate. Flowers solitary, leaf-opposed. Calyx cream with rich purplish brown stripes and spots, ferruginous puberulent outside; utricle 10–12 mm long; tube 15–20 mm long; lobes spreading, triangular, 5–9 mm long, dark maroon on revolute margin, mustard yellow inside; apex obtuse. Fruit subglobose to obloid, 1.8–4 cm long, 1.8–2 cm diam. Seed heart-shaped to triangular, 6–6.5 mm long, 6–6.5 mm diam., c. 1 mm thick, flat on both surfaces, verrucose.

Grows in notophyll vine forest, now rare due to clearing of lowland riverine and littoral closed forest.