This section is from the book "British Wild Flowers - In Their Natural Haunts Vol2-4", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
A yellow juice is afforded by the plant, which is poisonous and disagreeable, and has been said to cause madness. It is grown in gardens, and is a showy annual.
Essential Specific Characters: 19. Glaucium flavum, Crantz. - Stem branched smooth with yellow juice, leaves glaucous, sinuate, rough, amplexicaul, radical leaves lyrate. flower yellow, large, capsule tuberculate. linear. 2-valved. stigma sessile.