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An erect annual or biennial herb up to 2.5 m. tall.
Achenes pale- or greyish-brown; beaks paler, equalling or exceeding the achene in length; achene 3 x 1 mm., oblanceolate, somewhat laterally compressed, broadly-ribbed on the margins and narrowly c. 5-ribbed on each face, hispidulous towards the apices; pappus several-seriate of numerous white, barbellate setae c. 4 mm. long, free on the apically expanded beak.
Asteraceae – Aster family
Lactuca L. – lettuce