A biennial or sometimes perennial herb 0.3–1.2(1.8) m. high with erect annual stems, shortly hispid with antrorse hairs toward the apex, spreading below and sometimes retrorse near the base. Inferior leaves with petiole 2.5–8(13) cm. long, the superior ones almost sessile; lamina of the inferior leaves 8–15(20) x 2–4(6.5) cm., lanceolate to oblanceolate, that of the superior ones 2–6(8) x 0.4–1.8 cm., lanceolate to sublinear, roughish to shortly hispid above, roughish to pubescent below, acute at apex, attenuate at base and decurrent on the petiole; midrib and 2 lateral veins in all leaves usually prominent below. Cymes ebracteate above the first flower, often divaricate. Flowers with pedicels 1.0–2.5(3) mm. long, a little accrescent and recurved in fruit. Calyx 1.0–1.5 mm. long, divided to near the base; lobes ovate to oblong-ovate, roughish to shortly hispid outside, ciliate, glabrous inside, rounded at apex. Corolla 1.5–2.6 mm. long, white or blue or with the tube mauve and the limb white or bluish but deep blue at throat, glabrous; tube 0.7–1.4 mm. long, campanulate; lobes 0.6–1.5 x 0.6–1.5 mm., oblong-ovate to subcircular, rounded at apex; fornices much broader than long, semilunar. Stamens inserted at 0.6–0.9 mm. from the base of the corolla tube; anthers 0.4–0.6 mm. long, oblong; Filaments 0.2–0.3 mm. long. Style thick, up to 1.5 mm. long in fruit. Nutlets 1.5–2.5 x 1.2–1.8 mm. (without glochids), ovate, united to the style by a strap which detaches itself at complete maturity ± equally covered with 0.5–1.0 mm. long glochids; outer surface flat or convex, not marginate.