Stems gradually ascending, branched from base, 2.2-5 cm tall, densely obliquely spreading and appressed hispid. Basal and lower stem leaves long petiolate; petiole of upper stem leaves 0.2-1.8 cm; leaf blade spatulate, 1.4-4.5 cm × 3.5-8 mm, abaxially glabrous except for midvein and margin short strigose, adaxially more strigose, base attenuate, apex rounded to acute. Flowers opposite leaves. Pedicel of lower flowers 14-22 mm, 1-3 mm in upper flowers. Calyx ca. 2.8 mm, parted nearly to base; lobes narrowly triangular-lanceolate, densely pubescent outside, apex subobtuse. Corolla blue; tube ca. 2 mm, glabrous; appendages lunate, ca. 0.2 mm, sparsely short pubescent; limb 3-3.5 mm wide, glabrous; lobes suborbicular. Nutlets ovoid, ca. 1.8 mm, slightly wrinkled; aperture oblong to narrowly oblong, 1-1.5 mm; attachment scar below middle adaxially. Fl. Jun.
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