Description from Flora of China
Primula cyanantha I. B. Balfour & Forrest; P. watsonii Dunn subsp. cyanantha (I. B. Balfour & Forrest) W. W. Smith & Forrest.
Herbs perennial. Leaves forming a rosette; petiole narrowly winged, shorter than to occasionally nearly as long as leaf blade; leaf blade narrowly oblong to oblanceolate, 5--18 X 1--3.5 cm; tapering to base, with multicellular white hairs, margin irregularly denticulate, apex rounded or obtuse. Scapes 9--25(--38) cm, glabrous, yellow farinose toward apex; inflorescence short spicate, 10- to many flowered; bracts linear-lanceolate, shorter than calyx. Flowers reflexed, heterostylous. Calyx broadly campanulate, 3--5 mm, farinose at base, parted slightly below middle; lobes ovate to lanceolate, glandular ciliolate, apex acute. Corolla deep indigo-purple; tube 7--10 mm, 2--5 mm in diam.; lobes nearly quadrate, 1--2 mm, apex truncate to obscurely emarginate. Pin flowers: stamens at middle of corolla tube; style ca. as long as tube. Thrum flowers with positions reciprocal. Capsule unknown. Fl. Jul. 2n = 40@.
* Wet shaded areas on slopes, thicket margins; 3000--4000 m. W Sichuan, NW Yunnan