Erect herb, upto 1.5 m high; stem covered with spreading or appressed, soft hairs; leaves alternate, 3-7 cm long, ovate-lanceolate, acute, narrowed towards the base and often decurrent; upper surface covered with short, stiff hairs seated on bulbous bases which become white when dry; lower surface usually strigose with densely hairy nerves; margins more less denticulate, ciliate; flowers shortly pedicelled, in terminal and axillary curved racemes; calyx softly hairy, usually enlarged in fruit; lobes ovate-oblong, obtuse, ciliate, midrib conspicuous within; corolla campanulate, lobes-5, oblong or suborbicular, pale blue; stamens 5, included filaments very short; ovary lobes 4, stytle short, stigma small; nutlets 4, ovoid, uniformly appendiculate; appendages glochidiate at apex, not confluent at base, sometimes nutlets becomes oblique.