Description from Flora of China
Herbs, 25-35(-50) cm tall, glandular pubescent. Stems 1, rigid, to 3.5 mm in diam., quadrangular, winged along ribs, unbranched or with 1-4 pairs of opposite branches. Leaves below smaller than others and often deciduous; leaf blade lanceolate to narrowly so, 1.5-3 cm X 3-5 mm, densely brown glandular pubescent, base broadly cuneate, subamplexicaul, decurrent into stem wing, margin entire, apex obtuse to subacute, 1-veined. Racemes 1/3-1/2 of stem length; bracts longer than flowers. Pedicel 1-1.5 mm, slender. Bracteoles ca. 4 mm. Calyx 1.2-1.5 cm X 7-9 mm; lobes triangular-ovate. Corolla yellow, 1.6-1.8 cm, pubescent; tube 1-12 mm; upper lip galeate, 6-7 mm, emarginate. Stamens included; anther locules ca. 1.5 mm. Capsule ovoid, 8-10 mm. Seeds black, less than 0.5 mm. Fl. Jul-Oct, fr. Sep-Oct.
* Scrub; 1700-2600 m. Yunnan.