Yellow-flowered Mexican Poppy (Argemone mexicana)
This plant is very similar to the White-flowered Mexican Poppy and can be easily confused. The Yellow-flowered Mexican Poppy is an extremely spiny, herbaceous annual that can grow up to 90cm high. The stems exude a yellow sap when cut. Leaves are grey or bluish-green and spiny with prominent white veins. Bright yellow flowers appear from September to January followed by spiny, egg-shaped green fruit capsules that turn brown and release numerous small black seeds. The sap and spines are poisonous and can cause skin irritation.