Stems single, 0.5-1 m tall, glabrous or hirsute. Cauline leaves usually sessile; blade ovate-lanceolate, elliptic-lanceolate, or sometimes linear, 3-19 × 0.2-5 cm, glabrous or hirsute, margin entire or serrate (denticulate when narrow), apex acuminate. Inflorescence with long branches, forming a large and lax panicle, sometimes with short branches, forming a narrow panicle, less frequently only several flowers in a pseudoraceme; main axis and branches filiform. Hypanthium ellipsoid or sometimes ovoid; calyx lobes spreading or reflexed, filiform, (3-)6-14(-20) mm, margin entire or sometimes with 1 to several verrucose denticles below. Corolla pale blue, pale purple, or white, subtubular, tubular-funnelform, or urceolate, 10-18 mm; lobes narrowly triangular, 3-4 mm. Disk narrowly tubular, 2-5 mm, often glabrous. Style 15-25 mm, strongly exserted. Capsule globose, ellipsoid, or ovoid, 4-9 × 4-5 mm. Seeds brown, ellipsoid, 1-1.6 mm, 1-ribbed.
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A herb. It keeps growing from year to year. It has a single stem and grows 1 m tall. The leaves on the stem usually do not have leaf stalks. They are narrowly sword shaped and 3-19 cm long by 1-5 cm wide. There can be teeth along the edge. The flowers are in a loose panicle with long branches. They are pale blue, pale purple or white. They are tube shape or urn shaped. There are some subspecies.
It is a temperate plant. It grows in central and western China. In grows on the edges of forests and on grassy slopes between 1,100-3,600 m above sea level. In Sichuan and Yunnan.
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