Petiole to 12 cm, densely brownish villous; leaf blade lanceolate to ovate, 5-15.5 X 3.4-8 cm, adaxially sparsely appressed pubescent and villous or densely pubescent, abaxially appressed pubescent and villous or villous, glabrescent, especially between veins, base sometimes slightly oblique, broadly cuneate to cordate, margin serrate to crenate, often doubly so, apex acute; lateral veins 7-10 on each side of midrib, distinct. Cymes 3-10-flowered; peduncle 12-40 cm, rust-brown villous; bracts 2, lanceolate to narrowly lanceolate, 6-16 X 1-5 mm, rust-brown villous, margin entire or sparsely dentate to serrate. Pedicel 0.5-4.5 cm. Calyx segments lanceolate to linear, 6-10 mm, margin 2-or 3-denticulate or entire. Corolla yellow, 1.2-2.2 cm, outside pubescent; tube cylindric, narrowed at mouth, 0.8-1.4 cm X 3-6 mm; limb 2-lipped; adaxial lip 2-sect from near base, lobes 3.5-4 X 1.5-2 mm; abaxial lip lobes ca. 5-6 X 2.5-3.5 mm. Stamens adnate to corolla 2-5 mm above base, 4-5 mm; filaments flattened to slender, sparsely pubescent near apex or white villous; anthers broadly oblong, 2-loculed, dehiscing longitudinally, connective glabrous; staminode 1, 0.5-2 mm. Disc 1-2 mm, 5-lobed. Pistil 8-10 mm, glabrous to sparsely glandular puberulent. Stigma 1, disc-shaped. Capsule 2.8-3.7 cm. Fl. Aug-Sep, fr. Sep-Oct.
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