Description from Flora of China
Mimulus szechuanensis var. glandulosa Pai.
Perennials, to 60 cm tall, erect. Rhizomes long, rooting from nodes. Stems quadrangular, glabrous or sometimes villous, narrowly 4-winged, often branched. Petiole ca. 1.5 cm; leaf blade ovate, 2-6 X 1-3 cm, base cuneate, margin sparsely toothed, apex acute. Flowers solitary in upper leaf axils. Pedicel 1-5 cm. Bracteoles absent. Calyx tubular, 1-1.5 cm, ca. 2 cm in fruit, pubescent, narrowly winged, apex oblique; lobes spinelike, upper lobe largest. Corolla yellow; tube ca. 2 cm, slightly longer than calyx; throat with a purple patch; lower lip as long as upper lip. Capsule narrowly ellipsoid, 1-1.5 cm, somewhat compressed, included in persistent calyx. Seeds brown, ovoid; seed coat reticulate. Fl. Jun-Aug.
The combination Erythranthe szechuanensis (Y. Y. Pai) G. L. Nesom (Phytoneuron. 2012-39: 40. 2012) appeared after publication of the family treatment for the Flora of China.
* Moist places in forests, along streams; 1300-2800 m. Gansu, Hubei, Hunan, Shaanxi, Sichuan, Yunnan.