Lactuca quercina is a species of wild lettuce native to Europe and Asia.

It is an annual or biennial herb in the tribe Cichorieae within the family Asteraceae growing from a taproot to maximum heights of 50–200 cm (19.5–78.5 in) or more.

[2][3][4][5] Lactuca quercina contains lactucarium, which is the milky sap (white latex) that flows through the stem, leaves, and roots of the plant.

It may be used as medicinal treatments for its anodyne, antispasmodic, digestive, diuretic, hypnotic, narcotic, and sedative properties.

Sap may be applied to skin in use for treatment of external warts.