The thorny stems are covered in bluish green serrated leaves with spiky tips.

The flower buds are also covered in these sharp thin thorns until they open, between May and August, revealing six white petals up to four centimeters long and nine centimeters wide, and a bright yellow anther with various stamens jetting out.

The plant has sinuses that are square and broad, its veins and margins are armored in thin spiky thorns.

Argemone pinnatisecta has two to three sepals, six white petals, various stamens and bright yellow anthers.

[1] Argemone pinnatisecta in the 1980s numbered about 1300 individuals, however it has declined in recent years for unknown reasons.