Andrographis herb is an annual plant, 50 to 100cm high. The whole herb is intensely bitter. Stems is erect, branched, rectangular, and with slightly enlarged knobs. Leaves are opposite, from ovate-oblong to oblong-lanceolate, 2 to 11cm in length, 0.5 to 2.5cm in width, with apex acuminate, cuneate base, entire or shallowly undulate leaf margins, dark green above, gray-green below, and with 3 to 4 pairs of lateral veins. Petiole is short or subsessile. Panicles are terminal or axillary. Capsule is oblong, about 1.5cm long, flattened on both sides, with a central longitudinal groove. The flowering stage is from August to September, and mature fruiting phase is in October. It mainly grows in hot and humid plains and hilly areas.