The plant Sonchus oleraceus is a common sow thistle, also known as milk thistle, smooth sow thistle, annual sow thistle, hare's colwort, hare's thistle, milky tassel, and soft thistle.
It is an annual plant in the tribe Cichorieae of the family Asteraceae, native to Europe and Western Asia.
It has a hollow, upright stem up to 30–100 cm high.
The leaves of Sonchus oleraceus, or common sowthistle, are alternate, simple, and deeply lobed.
The basal leaves are the largest, up to 10-25 cm long and 5-10 cm wide.
They are sessile, with a long attenuated false winged petiole base.
The blade is deeply divided into 3-5 pairs of oblong lobes and a terminal lobe larger, triangular or subcircular, the apex obtuse.
The upper leaves are smaller and less lobed.
The leaves are covered with a white, milky sap when cut.
The leaves of common sowthistle are edible and can be used in salads, cooked greens, or as a potherb.
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