Description from Flora of China
Campanula aristata var. longisepala C. Marquand; C. cylindrica (Pax & K. Hoffmann) Nannfeldt; Wahlenbergia cylindrica Pax & K. Hoffmann.
Plants perennial. Roots thickened, carrot-shaped. Stems usually caespitose, erect, 10-50 cm tall. Basal leaves long petiolate, glabrous; blade ovate or broadly elliptic. Lower and middle cauline leaves long petiolate, glabrous; blade lanceolate, elliptic, or linear. Middle and upper cauline leaves sessile, glabrous; blade linear, 1.5-7 cm, glabrous, margin entire or sparsely denticulate. Hypanthium very narrowly oblong, 0.5-1.5 cm; calyx lobes filiform, (3-)7-18(-25) mm, usually longer than corolla. Corolla blue or blue-purple, 7-15 mm; lobes ca. 1/2 as long as tube. Capsule clavate, attenuate at base, 20-40 mm. Seeds brown-yellow, elliptic, slightly compressed, ca. 0.7 mm, smooth. Fl. Jun-Aug, fr. Aug-Sep.
Alpine meadows or thickets; 3500-5000 m. S Gansu (Xiahe), E and S Qinghai, Shaanxi (Taibai Shan), NW and W Sichuan, Xizang (except NW), NW Yunnan (Dêqên) [Afghanistan, Bhutan, India, Nepal, Pakistan].