对折龙胆 dui zhe long dan

Annuals 2-3 cm tall. Stems ascending, branched from base, glabrous. Basal leaves with petiole 0.5-0.8 mm; leaf blade ovate-lanceolate to ovate, 2-5 × 2-2.5 mm, margin cartilaginous and smooth, apex acute and apiculate, midvein distinct. Stem leaves 5-8 pairs, folded; petiole tube 1-1.5 mm; leaf blade 2.5-4 × 1-1.5 mm, ± as long as internodes, basal half margin narrowly membranous and ciliolate but apical half cartilaginous and smooth, apex acute to obtuse, midvein abaxially prominent. Lower stem leaf blades ovate; middle to upper leaves oblong to elliptic. Flowers few. Pedicel 3-4 mm, surrounded by leaves, glabrous. Calyx narrowly obconic, 5-7 mm; lobes triangular, 1-1.3 mm, margin narrowly membranous, apex acute, midvein prominent. Corolla blue-purple, with pale yellow-green base and a blackish ring in throat, tubular to narrowly funnelform, 0.9-1.1 cm; lobes ovate, 1.5-2 mm, margin entire, apex obtuse; plicae oblong, 1-1.5 mm, margin denticulate, apex truncate. Stamens inserted at middle of corolla tube, equal; filaments 2.5-3 mm; anthers narrowly ellipsoid, 0.8-1 mm. Style 1-1.5 mm; stigma lobes oblong. Capsules narrowly obovoid, 5-6 mm; gynophore to 2.5 cm, stout. Seeds brown, ellipsoid, 1-1.2 mm. Fl. and fr. Jun.

* Grassland slopes; ca. 4000 m. SW Sichuan.