Annual or biennial weed, propagating itself by seed, 10-25 cm (3.93 - 9.84 inch) tall.
Offensive smell; leaves do not clasp the main stalk, but are stemmed.
Small, a round oval in shape, smooth-edged, stemmed, with a small notch at the tip and, often, two overlapping lobes at the base.
Bushy and branching, square in cross-section, often red-to-violet above.
Opposite, forming a cross, a rounded heart-shape, with long stems.
The upper leaves with short stems and often with a reddish tinge near the inflorescence.
The leaf edge saw-toothed.
Distinct leaf veins.