Description from Flora of China
Climbing shrubs; branches terete, sparsely strigillose to glabrescent. Leaves opposite; petiole 4-12 mm, moderately to densely strigillose; blade drying papery, lanceolate or oblong-lanceolate, 5-10 × 1.5-3 cm, adaxially glabrous or sparsely strigillose along principal veins, abaxially sparsely strigillose to glabrous with pubescence denser along veins, base cuneate or obtuse, apex acuminate; secondary veins 4 or 5 pairs, tertiary venation subparallel; stipules deciduous, triangular, 3-6 mm, moderately strigillose, deeply 2-lobed, lobes narrowly triangular to subulate. Inflorescences terminal on main stems and sometimes short lateral stems, congested to somewhat laxly cymose, 1-3 × 1.5-3 cm, moderately to densely strigillose and strigose, pedunculate; peduncles 1.5-2 cm; bracts triangular, 3-3.5 mm; pedicels 1-3 mm. Flowers pedicellate, biology not noted. Calyx with hypanthium portion ellipsoid to subturbinate, 2-2.5 mm, sparsely strigillose; lobes narrowly triangular, 1.5-2.5 mm, densely strigillose, with 1 lobe on 1-3 flowers per inflorescence expanded into calycophyll, blade narrowly oblong-elliptic to oblanceolate, 3-4 × 0.8-1.2 cm, both surfaces sparsely to moderately strigillose, base acute, stipe 5-16 mm, apex obtuse or acute. Corolla yellow, salverform, outside moderately to densely strigillose; tube 13-15 mm, with yellow clavate pubescence in throat; lobes triangular to ovate, ca. 2 mm, adaxially densely yellow papillose, acuminate. Berry unknown. Fl. Apr-Jun.
● Wet soil in dense forests. Hainan (Ledong).