Prickly Lettuce - Lactuca serriola

Tall, greyish, stiff and erect plant to 1.8 metres. Stem sometimes bristly. Leaves alternate, oblong, prickly on margins and along the mid-rib beneath, sometimes irregularly lobed, clasping the stem with arrow shaped points. Upper leaves held in a vertical position, their edges pointing north-south when in sunlight. Flowerheads pale yellow 11 to 13 mm numerous, in a narrow pyramidal panicle. Achenes greyish.

Disturbed and waste ground, roadside verges, motorway banks.

July to September.

Annual or biennial.

Most records in Britain are from central and southern England.

Once infrequent, but now quite common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 25 of the 617 tetrads.