Description from Flora of China
Ficus bonii Gagnepain.
Trees or shrubs. Bark smooth. Branchlets purplish brown when dry, terete, glabrous, sparsely lenticellate. Stipules lanceolate, ca. 1 cm. Petiole slender, 2-4 cm, glabrous, apically articulate; leaf blade ovate to cordate, 5-9 × 3-6 cm, ± leathery, pale green when dry, base rounded to ± cordate, margin entire, apex acute to acuminate; basal lateral veins expanded, secondary veins 5-7 on each side of midvein, raised on both surfaces. Figs axillary on leafy branchlets, solitary or paired, globose, 5-7 mm in diam., smooth, apical pore not concave, sessile; involucral bracts orbicular to reniform, ca. 2 mm, margin ciliate. Male, gall, and female flowers within same fig. Male flowers: few, near apical pore, pedicellate or sessile; calyx lobes 3 or 4, lanceolate, margin serrate; stamen 1; filament short; anther ellipsoid. Gall and female flowers: many, similar; sepals 3 or 4; ovary obovate; style apical, very short in gall flowers. Fl. May-Jul.
Guangxi (Longzhou) [N Vietnam].