Sonchus Asper Plants Royalty-Free Stock Photo

Sonchus asper is an annual or biennial herb sometimes reaching a height of 150-200 cm. with spiny leaves and yellow flowers resembling those of the dandelion, leaves are bluish-green, simple, lanceolate, with wavy and sometimes lobed margins, covered in spines on both the margins and beneath. The base of the leaf surrounds the stem. The leaves and stems emit a milky sap when cut. One plant produce several flat-topped arrays of flower heads, each head containing numerous yellow ray flowers.