Annual or biennial herb. Stem 8-100 cm high, branched very much, hirsute with dense, more or less distinctly retrorse hairs in the lower, antrorse hairs in the upper part of stem and branches. Leaves elliptical oblong, oblong, elliptical, oblong-lanceolate or lanceolate; petiole 4-7 cm long in lower leaves, gradually decreasing in length upwards; blade 12-15 by 3.5-5 cm, long tapering towards petiole in lower leaves, 7-10 by 1-3 cm in middle, 1.5-6 by 0.3-1.5 cm, sessile with narrow base in upper leaves, obtuse to subacute, with numerous, very distinct nerves on both sides, strigose with antrorse longer and shorter hairs, the longer ones arising from groups of mineralized cells on upper, with soft, spreading hairs denser along the nerves on lower side. Inflorescence much branched, cymes divaricate, ebracteate; pedicels less than 1 mm in flower, 1-3 mm in fruit, patent or curved downwards, densely hairy. Calyx 1.5-2 mm long in flower, lobes 2.5 mm long, 0.8-1 mm wide in fruit, obtuse, hairs subappressed, antrorse. Corolla white or pale blue, campanulate to funnel-shaped, glabrous, 2.5-3 mm long, 3.5-4 mm in diam., tube slightly shorter or equal to calyx, lobes oblong, 1.5-1.8 mm long, 1-1.2 mm wide; fornices large, subquadrate. Stamens: filaments very short, anthers ovate, half the size of the fornices, reaching their bases. Pistil: style 1.5 mm long, stigma small, bilobed. Nutlets ovate in outline, convex dorsally, 2-3 mm long, 1.5-2 mm wide, glochids equally distributed or slightly looser dorsally.
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