An erect, branched, very variable annual, 30-60, cm. high. Leaves pinnately divided: segments more or less cut, awaned; flowers scarlet, with a dark eye; capsules sub-globse, smooth; seeds dark brown.

Expectorant, sedative, diaphoretic and pain reliever (flower); narcotic (latex); antimicrobial, anticancer (plant extract); sudorific, sedative and anodyne (petals); anodyne, emollient, emmenagogue, expectorant, hypnotic, slightly narcotic and sedative (flowers and petals)

Papaver rhoeas L.
Plants for a Future
Botanical.com

Berberine, allo-cryptopine, glaucamine and glaudine (plant); mecocyanin chloride, cyanidin-B and pelargonidin-C (flower); rhoeadine (leaf, root, capsule and flower); coptisine and protopine (root and aerial part); rhoeadic and papaveric acids (fresh petals)

As a pain reliever, diaphoretic, insomnia, jaundice, hoarse voice and cough (flower); as a tonic (seed and leaf) and narcotic (latex)

Chandel et al., Biodiversity in Medicinal and Aromatic Plants in India.