Description from Flora of China
Herbs perennial, to 45 cm tall, glabrous throughout. Stems erect, often branched above middle, sparsely black glandular punctate and striate. Branches usually shorter than leaves, leafy only at apex. Leaves opposite, sessile or petiole 2--4 mm; leaf blade lanceolate, 6--8 X 1.5--2.2 cm, densely dark glandular punctate, especially near margin, base cuneate, margin entire or obscurely repand, apex acuminate; midvein reddish, keeled abaxially; veins 5 or 6 pairs, prominent. Racemes terminal, compact, 4- to many flowered; peduncle 0.5--1.5 cm, glandular; bracts ovate, ca. 9 mm, adnate to upper part of pedicel. Pedicel 2--4 mm, glandular. Calyx lobes lanceolate, ca. 9 X 15 mm, black glandular punctate near apex, apex acuminate-subulate. Corolla yellow; tube 1.5--2 mm; lobes elliptic, 8--8.5 X ca. 5 mm, black glandular striate, apex obtuse. Filaments connate basally into a ca. 2.5 mm high tube, free parts 3--5 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 1.7 mm. Ovary glabrous, black glandular punctate; style ca. 6.5 mm. Capsule unknown. Fl. Jun.
* Forest margins, streamsides. SE Zhejiang.