Smooth Sow-thistle - Sonchus oleraceus
Short to tall greyish plant. Upper leaves clasp the stem with triangular, leaves with pointed basal lobes. Flowerheads pale yellow 20 to 25 mm, borne in lax clusters.
Auricles of stem-leaves pointed. Achenes transversely rugose. Leaves deeply pinnately lobed, but can be very similar to S asper
Photograph of stem and leaves, showing auricles
Bare and waste ground, roadsides. A weed of cultivation.
May to November.
Very common throughout Britain except for parts of the Scottish Highlands.
Very common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 530 of the 617 tetrads.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015