3. Mertensia davurica (Sims) G. Don, Gen. Hist. 4: 318. 1837.
长筒滨紫草 chang tong bin zi cao
Pulmonaria davurica Sims, Bot. Mag. 42: t. 1743. 1814; Lithospermum davuricum (Sims) Lehmann; Mertensia ochroleuca Ikonnikov-Galitzky.
Rhizomes black-brown, tuberlike. Stems single, erect, 20-30 cm tall. Basal leaves forming a rosette, crowded, long petiolate, ovate-oblong to linear-oblong, base cuneate to rounded; stem leaves only 3 or 4 per stem, subvertical, sessile, only lowest leaves petiolate but frequently withering early, lanceolate to linear-lanceolate, 1.5-3 cm × 1.5-3.5 mm, obscurely veined, abaxially glabrous, adaxially short appressed pubescent and tuberculate, apex obtuse to acuminate. Inflorescences branched, striate, glabrous at base, sparsely pubescent at apex. Cymes 1-1.5 cm, densely short appressed pubescent, usually 2 or 3 borne at apex of stem. Pedicel 2-5 mm. Calyx ca. 4.5 mm, 5-parted nearly to base; lobes linear to linear-triangular. Corolla blue, 1.2-2.2 cm, glabrous; tube straight, ca. 3.5 × as long as limb, 2-3.5 mm wide; throat appendages lunate, ca. 0.5 mm, smooth; limb slightly wider than tube, 5-lobed; lobes slightly spreading, nearly semiorbicular, ca. 2 mm, margin entire. Stamens inserted between appendages; filaments ca. 2 mm; anthers linear-oblong, ca. 2.5 mm. Style ca. as long as corolla; stigma discoid. Nutlets ca. 2.5 mm, wrinkled; attachment scar narrowly triangular. 2n = 24.
Hillside meadows. N Hebei [Mongolia, Russia].