Gentiana yokusai Burkill

Annuals 2.5-14 cm tall. Stems ascending to erect, branched throughout, usually with 2-5 crowded flowering branches, densely papillate. Petiole 1.5-2.5 mm, margin ciliolate; leaf blade adaxially sometimes densely and minutely papillate, base obtuse, margin thick cartilaginous, apex acuminate and with an aristate tip to 0.7 mm, midvein prominent. Basal leaf blades lanceolate to ovate-lanceolate, 0.7-2.2 cm × 4.5-8 mm. Stem leaves spreading; leaf blade ovate or cordate, 4-12 × 3-6 mm. Pedicel 1.2-1.5 mm, papillate. Calyx narrowly obconic, 5-8 mm; lobes slightly spreading, lanceolate to ovate, 2-3 mm, slightly unequal, base slightly narrowed, margin thick cartilaginous and ciliolate, apex acuminate and with an aristate tip to 0.7 mm, midvein prominent. Corolla blue to blue-purple, funnelform, 7-12 mm; lobes ovate, 2-2.5 mm, margin entire, apex obtuse; plicae ovate, 1-1.5 mm, margin entire or denticulate, apex obtuse. Stamens inserted just below middle of corolla tube, equal; filaments 2-2.5 mm; anthers narrowly ellipsoid, 0.5-0.8 mm. Style 1.5-2 mm; stigma lobes linear. Capsules narrowly obovoid to obovoid, 3-6.5 mm; gynophore to 1.3 cm, stout. Seeds light brown, oblong to ellipsoid, 0.7-1 mm. Fl. and fr. Mar-Sep.

Anhui, Fujian, Guizhou, Hebei, Hubei, Hunan, Jiangsu, Jiangxi, Nei Mongol, Shaanxi, Shanxi, Sichuan, Taiwan, Zhejiang [Japan, Korea]

0-2700 m.

Gentiana yokusai là một loài thực vật có hoa trong họ Long đởm. Loài này được Burkill mô tả khoa học đầu tiên năm 1906.

灰绿龙胆（学名：Gentiana yokusai）是龙胆科龙胆属的植物。分布在台湾岛、朝鲜以及中国大陆的湖北、江苏、贵州、安徽、福建、广东、陕西、湖南、山西、河北、四川、江西等地，生长于海拔50米至2,650米的地区，常生长在荒地、山坡阳处、空旷地、林下、水边湿草地、路旁、农田、山顶草地或灌丛中，目前尚未由人工引种栽培。