Glabrous twiner.. Leaf-blade ovate, up to 9 cm. long and 6 cm. wide, acuminate at the apex, cordate at the base, very densely and minutely glandular-punctate beneath; petiole 2.5–13 cm. long.. Inflorescences very lax, 1–4-flowered; peduncle 3.5–7.5 cm. long; secondary peduncles and pedicels 1–3.5 cm. long.. Sepals rounded-oblong, 5.5–8 mm. long, 5–6(–7) mm. wide, ± truncate above, hyaline and minutely ciliate at the margin.. Corolla pale mauve, narrowly funnel-shaped, 7.5–8 cm. long.. Fruit not known.
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