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Smooth Sow-thistle Numerous pale yellow flowers, followed by seedheads with unbranched hairs. Wavy-edged leaves clasping stem, more/less lobed, blue-greenish. Pointed bases. Hollow stems filled with milky-white latex. Height: 20-150 cm. Very common on arable land, waste ground, roadsides, gardens. Similar: Prickly Sow-thistle, S. asper |