Description from Flora of China
Onosma potaninii Popov.
Herbs perennial, suffrutescent, 15-30 cm tall. Stems branched from base, hispid, strigose; branches erect, ascending to prostrate, 5-15 cm; old branches woody, laciniate. Leaf blade oblanceolate, 1-1.5 cm × 2-5 mm, hispid along margin and veins, abaxially gray-green, strigose, with many short hairs, adaxially green, hispid and strigose, base attenuate into a petiole, apex acute to obtuse. Inflorescences solitary, rarely branching, terminating branches, ca. 5 cm at anthesis; bracts lanceolate to ovate-lanceolate, ca. 3 mm. Pedicel ca. 3 mm at anthesis, to 9 mm in fruit. Calyx lobes linear to linear-lanceolate, 7-9 × ca. 1 mm, hirsute, strigose. Corolla blue, 8-9.5 mm; throat 4-5 mm wide, strigose outside above, villous inside near filament insertion; nectary ca. 0.5 mm, villous. Filaments 5-7 mm, not decurrent, base slightly expanded, densely villous, inserted 2.5-3 mm above base of corolla tube; anthers laterally united, 6-7 mm, apex sterile, 0.5-1 mm, nearly completely exserted. Nutlets brown, 2-2.5 mm, densely tuberculate. Fl. May-Jul., fr. Aug.
* Dry banks, ravines, rocky hillsides, Quercus forests; 1700-3200 m. S Gansu, N Sichuan.