The stem of Artemisia annua is erect, up to 80 cm in height, and many twigs can be divided into small leaves.
The stem of Artemisia annua is single, the lower part is slightly lignified, the longitudinal edge is very obvious, white hairs are distributed, and the main root under the stem presents a vertical narrow spindle shape.
The leaves of Artemisia annua are pinnate and deeply split. The lobes of the end leaves are strip or oblong. The leaves above the lobes have no handle, and the leaves below have handle.
The shape of Artemisia annua leaves is wide egg, with small white hairs distributed on both sides, 4 to 8 cm long and 3 to 6 cm wide.
The flower color of Artemisia annua is yellow, showing the shape of spoon, oblong obovate, 2 to 2.5mm long, the same size as the calyx or slightly shorter than the sepal, and the flowering period is from April to May.
The flower heads of Artemisia annua are large, hemispherical or nearly spherical in shape, and the flowering period is about June.
