Arabidopsis thaliana

Very delicate, scant-pubescent, blue-green, annual herb.

5–30 cm high.

The plant has a single stem or multiple stems, which are typically branched and pubescent near the base.

The basal leaves form a rosette. All leaves are sessile, attenuate, simple and entire, except the margin of the basal leaves is repand.

There are four petals and sepals in a flower. The sepals are often purplish and the outermost sepals are attenuate at the base. The petals are white and 2–4 mm long. The anthers are 0.2–0.4 mm long.

The fruit is a silique typically 1–1.5 cm long, about twice as long as the pedicel, slightly compressed on the side perpendicular to the false septum, short-beaked and has single vein on each half. The pedicel is divergent to ascending. The size of a seed is about 0.5 mm.