弄岗马兜铃 nong gang ma dou ling

Herbs twining. Stems 6-angled, glabrous. Petiole 2-8 cm, glabrous; leaf blade ovate-cordate to cordate or subrotund, 8-13 × 9-12 cm, papery, abaxially densely pubescent, adaxially glabrous, veins palmate, 3 pairs from base, base cordate, sinus 1-2 cm deep, apex abruptly acuminate. Racemes in axils of leafy shoots, 2-6-flowered, 3-4 cm. Pedicel ascending, 1-2 cm, glabrous; bractlets ovate or ovate-cordate, 5-7 × ca. 3 mm. Calyx brownish purple with dark purple veins; tube rectilinear, abaxially sparsely pubescent; utricle globose, ca. 4 mm in diam., sessile; tube ca. 10 × 2 mm; limb unilateral, ligulate, deltate-lanceolate, ca. 3.5 × 0.5 cm, apex long acuminate with twisted cauda 1-3 cm. Anthers elliptic, ca. 0.5 mm. Gynostemium 6-lobed. Capsule elliptic, ca. 7 × 2.5 cm, dehiscing acropetally. Seeds ovoid-cordiform, ca. 5 × 4 mm. Fl. Feb-Apr, fr. Sep.

Thickets on limestone mountain slopes; 100-200 m. Guangxi [Vietnam].