Petiole to 6.5 cm, rust-brown villous; leaf blade elliptic to ovate, 1.4-6 X 0.6-3.5 cm, gray pubescent and sparsely rust-brown villous, base sometimes oblique, broadly cuneate to cordate, margin coarsely double crenate to serrate, apex obtuse to acute; lateral veins 4 or 5 on each side of midrib, distinct. Cymes 1-7-flowered; peduncle 4-13 cm, sparsely brown villous; bracts 2, linear to lanceolate, 3-4 X ca. 1 mm, brown villous, margin entire. Pedicel 0.5-1.5 cm. Calyx segments narrowly lanceolate, 3-4.5 mm, margin entire. Corolla yellow, 1.2-1.8 cm, outside glabrous; tube campanulate-tubular, 6-8 (-10) X 5-6 mm; limb slightly 2-lipped; adaxial lip shallowly 2-lobed, lobes 2-5 X 3-4 mm; abaxial lip lobes 6-9 X 5-7 mm. Stamens adnate to corolla 1-3 mm above base, 1-1.4 cm; filaments slender, glandular pubescent; anthers broadly oblong, 2-loculed, dehiscing longitudinally, connective glabrous; staminode 1, ca. 1 mm. Disc 0.8-1.5 mm, entire. Pistil ca. 1.4 cm, glabrous. Stigma 1, disc-shaped. Capsule 1.8-3.5 cm. Fl. May-Jul, fr. Sep-Oct.
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