黑紫龙胆 hei zi long dan

Annuals 3-5 cm tall. Stems purple, ascending, much branched with prostrate branches, densely papillate. Petiole 2.5-5 mm; leaf blade reniform to suborbicular, 1.5-3 × 2-4.5 mm, base rounded, margin smooth, apex rounded, midvein distinct. Flowers terminal, solitary, sessile or subsessile, 5merous. Calyx tube narrowly obconic, 6-8 mm; lobes reniform to suborbicular, 1-2.5 mm, equal, base contracted into a tongue, margin scabrous, apex rounded, midvein distinct. Corolla dark purple, tubular, (0.8-)1-1.5 cm; lobes ovate, 1.5-2.5 mm, symmetric, margin entire, apex obtuse; plicae ovate, 1-1.5 mm, margin denticulate, apex obtuse. Stamens inserted at apical part of corolla tube, included in corolla, equal; filaments 1-2 mm; anthers ellipsoid, 0.4-0.5 mm. Style 1.2-1.5 mm, much shorter than ovary; stigma lobes subcapitate. Capsules narrowly ellipsoid, 6.5-7.5 mm; gynophore to 3 mm. Seeds brown, ellipsoid, 1-1.2 mm. Fl. and fr. Aug.

* Grassland slopes; 3200-3800 m. SW Sichuan.