Description from Flora of China
Onosma multiramosum var. mekongense I. M. Johnston.
Herbs perennial, gray-green, ca. 30 cm tall. Stems erect, much branched, sparsely hispid and densely pubescent, hairs discoid at base. Lower stem leaves oblanceolate, 5-7 mm; middle stem leaves oblong-lanceolate, 3-4 cm × 6-10 mm, abaxially densely pilose, along midvein and margin sparsely hispid, adaxially hispid, pubescent, base attenuate, apex acuminate. Inflorescences solitary, terminal, 1-2 cm wide at anthesis. Pedicel 2-3 mm. Calyx lobes linear-lanceolate, 7-8 mm, densely villous inside, slightly shorter than corolla tube. Flower buds curved at apex. Corolla yellow, tubular-campanulate, 8-9 mm, ca. 1.5 mm wide at base; throat 4-4.5 mm wide, upper 1/3 densely short hispid outside; nectary ca. 0.5 mm, 5-lobed, pubescent; lobes broadly triangular, appressed pubescent inside, margin revolute. Filaments subulate, 5-6 mm, inserted ca. 3.5 mm above base in corolla tube, decurrent part linear, 1.5-2 mm; anthers laterally united, blue-purple, ca. 9 mm, curved at apex, mostly exserted, apex sterile, ca. 3 mm. Style 1.3-1.5 cm, glabrous. Nutlets 2.5-3 mm, wrinkled, tuberculate. Fl. and fr. Aug.
* Valleys, arid slopes; 1600-3100 m. SW Sichuan, E Xizang, NW Yunnan.