Gentiana aperta Maxim.

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, 5-7 × 3-4 mm, margin narrowly and indistinctly membranous, apex obtuse, veins 1-3, distinct, and slender. Stem leaves 3-5 pairs, widely spaced; petiole tube 1-2 mm; leaf blade elliptic, rarely ovate toward base of stem, 5-9 × 1-2.5 mm, much shorter than internodes, margin narrowly and indistinctly membranous, apex obtuse, veins 1-3, distinct, and slender. Flowers few. Pedicel 0.5-1.5 cm, much exserted from uppermost leaves, glabrous. Calyx campanulate, 5.5-6.5 mm; tube herbaceous, with 5 membranous longitudinal veins; lobes linear-lanceolate to lanceolate, 2.5-3.5 mm, margin narrowly membranous, apex acuminate, midvein prominent. Corolla open, white or pale blue to blue, inside with or without dark blue stripes but with pale yellow spots in throat, campanulate, 0.9-1.2 cm; lobes elliptic to ovate-elliptic, 2-3(-4) mm, margin entire, apex obtuse; plicae oblong, 1.5-2(-3) mm, apex deeply 2cleft with both segments entire and acute. Stamens inserted at basal part of corolla tube, equal; filaments 4-5 mm; anthers ellipsoid, 0.6-0.8 mm. Style 1.5-2 mm; stigma lobes linear. Capsules narrowly obovoid, 4-5 mm; gynophore to 1 cm, stout. Seeds light brown, ellipsoid, 0.9-1.1 mm. Fl. and fr. Jun-Aug.

NE Qinghai

* 2000-4000 m.

Gentiana aperta là một loài thực vật có hoa trong họ Long đởm. Loài này được Maxim. mô tả khoa học đầu tiên năm 1881.

开张龙胆（学名：Gentiana aperta）是龙胆科龙胆属的植物，为中国的特有植物。分布于中国大陆的青海等地，生长于海拔2,000米至4,000米的地区，常生于山麓草地、山坡草地、灌丛中及河滩，目前尚未由人工引种栽培。