Kutki is a small perennial herb, that usually grows to a height of about 20-30 cm. The plant has roots that are elongated, tubular, straight or slightly curved with a few longitudinal and dotted scars, mostly attached with rhizomes. The useful rhizome part of the plant is normally thick, sub-cylindrical, straight or curved, with a greyish-brown tinge, marked externally with longitudinal furrows and spherical scars of roots. The plant has creeping stem which is small, weak, leafy and slightly hairy. Leaves are 5-15 cm long, oblanceolate, toothed, narrowed to a winged stalk, and are alternately arranged on the stem. Flowers are small, pale or purplish blue, borne in cylindric spikes, and are 5 lobed. Flowering period lasts long and usually takes place from June to August. The fertilized flowers are followed by a two-celled, small spherical capsule, tapered at the top, divided into 4 valves, and enclosing several white, oblong seeds.