Onosma microstoma I. M. Johnston, J. Arnold Arbor. 32: 360. 1951.

Herbs perennial, 30-50 cm tall, with stout roots. Stems several, cespitose, erect or ascending, unbranched, densely yellow hispid, short strigose. Basal leaves linear-lanceolate, 4-10 cm × 3-7 cm, abaxially densely strigose and densely hispid on midvein and margin, adaxially hispid and strigose, gradually withered at anthesis; stem leaves crowded, sessile, lanceolate, 3-6 × 1-1.5 cm, base rounded, apex acuminate. Inflorescences terminal, subcapitate, 3-4 cm wide at anthesis, many flowered. Pedicel slender, 2-8 mm, densely yellow hispid. Calyx cupular, 6-8 mm, yellow hispid and short strigose outside, densely white villous inside, parted to middle or slightly below; lobes narrowly triangular, ca. 5 mm. Corolla blue-purple, 1.1-1.6 cm, base 1.5-2 mm wide, gradually expanded upward, widest above middle, 7-9 mm wide; throat constricted, 3-4 mm wide, densely short strigose, 5-sulcate below middle; folds inflated, 4-6 mm, pubescent; nectary 1-1.5 mm, pubescent. Filaments subulate, 4-4.5 mm, pubescent at base, inserted 5-6 mm above base of corolla tube; base of anthers united, 5-5.5 mm, included, sterile apex ca. 1 mm. Style 1.6-1.7 cm, glabrous, exserted. Fl. Aug.

* Open rocky slopes; ca. 3000 m. SW Yunnan.