184. Gentiana prainii Burkill, J. & Proc. Asiat. Soc. Bengal. 2: 317. 1906.
柔软龙胆 rou ruan long dan
Gentiana gracilenta T. N. Ho.
Annuals 4-10 cm tall. Stems prostrate to ascending, weak, 1 or 2 × dichotomously branched from base, glabrous. Leaf blade papery, glabrous, apex obtuse, veins indistinct. Basal leaves withered at anthesis; petiole 0.5-1 mm; leaf blade elliptic, 1.5-5 × 1.2-3 mm. Stem leaves widely spaced; petiole 0.5-0.7 mm, entirely connate; leaf blade ovate to cordate, 4-6 × 2-3 mm, shorter than internodes. Flowers few. Pedicel 0.5-1.5 cm, glabrous. Calyx campanulate, 2-2.5 mm; lobes triangular-subulate, 0.8-1 mm, margin narrowly membranous, apex acute, midvein indistinct. Corolla outside pale blue-gray, inside pale yellow-white, campanulate, 5-6 mm, to 9 mm in fruit; lobes obliquely ovate, 1.2-4.5 mm, margin entire, apex obtuse; plicae extremely oblique, auricular, attached to right side of each lobe, 0.3-0.4 mm, margin entire, apex obtuse. Stamens inserted at middle of corolla tube, equal; filaments 1.5-2.5 mm; anthers ellipsoid, ca. 0.3 mm. Style short but distinct, only ca. 0.3 mm; stigma lobes oblong. Capsules narrowly obovoid to obovoid, 3.5-4.5 mm, apex rounded, 3 or 4seeded; gynophore to 1.5 cm, stout. Seeds dark brown, ellipsoid, 1.3-1.4 mm. Fl. and fr. Sep.
Steep open grassy hillsides; 3800-4500 m. S Xizang [Bhutan, Sikkim].