Gentiana leucomelaena Maxim.

The widespread Gentiana leucomelaena is similar to the much more narrowly distributed G. aperta. Although T. N. Ho treats them as distinct species, J. S. Pringle considers G. leucomelaena as a sy-nonym of G. aperta.

Annuals 2-10 cm tall. Stems prostrate to ascending, branched from base, glabrous. Basal leaves withered at anthesis; petiole 1-2 mm; leaf blade ovate-elliptic to ovate-orbicular, 5-8 × 2-3 mm, margin indistinctly membranous, apex obtuse to rounded; veins 1-3, indistinct. Stem leaves 3-5 pairs; petiole tube 1.5-3 mm; leaf blade lanceolate to elliptic, rarely basally spatulate to ovate, 3-9 × 0.7-2 mm, usually shorter than internodes, margin narrowly and indistinctly membranous, apex acuminate to obtuse, midvein abaxially distinct. Flowers few. Pedicel 0.4-4 cm, glabrous. Calyx campanulate, 4-5 mm; lobes triangular, 1.5-2 mm, margin narrowly membranous, apex acute, midvein indistinct. Corolla pale blue, rarely white, with blue-gray stripes, with dark blue spots in throat, campanulate, 0.8-1.3 cm; lobes ovate, 2.5-3 mm, margin entire, apex obtuse; plicae oblong, 1.2-1.5 mm, margin irregularly laciniate, apex obtuse. Stamens inserted at basal part of corolla tube, equal; filaments 2.5-3.5 mm; anthers ellipsoid, 0.7-1 mm. Style 0.5-0.7 mm; stigma lobes oblong. Capsules obovoid, 3.5-5 mm; gynophore to 2 cm, stout. Seeds broadly dark brown, ellipsoid, 0.6-0.8 mm. Fl. and fr. May-Oct.

Gansu, Qinghai, Sichuan, Xinjiang, Xizang [Kashmir, Kazakhstan, Kyrgyzstan, N Mongolia, Nepal, Pakistan, Russia, Sikkim, Tajikistan]

Along streams, bog meadows, meadows, alpine meadows, scrub; 1900-5000 m.

Gentiana humilis Steven var. evolutior C. B. Clarke; G. leucomelaena var. alba Kusnezow; G. leucomelaena var. pusilla Krylov.

Gentiana leucomelaena là một loài thực vật có hoa trong họ Long đởm. Loài này được Maxim. mô tả khoa học đầu tiên năm 1891.

蓝白龙胆（学名：Gentiana leucomelaena）是龙胆科龙胆属的植物。分布在印度、蒙古、尼泊尔、俄罗斯以及中国大陆的甘肃、新疆、四川、青海、西藏等地，生长于海拔1,940米至5,000米的地区，常生于沼泽地、湿草地、河滩草地、山坡草地、山坡灌丛中、沼泽化草甸和高山草甸，目前尚未由人工引种栽培。