Mexican Poppy

Argemone mexicana (Mexican poppy, Mexican prickly poppy, cardo or cardosanto) is a species of poppy found in Mexico and now widely naturalized in the United States, India and Ethiopia. An annual herb with bright yellow sap, it has been used by many people including those in its native area, the Natives of the western US and parts of Mexico.

The seeds resemble the seeds of Brassica nigra (mustard). As a result, mustard can be adulterated by argemone seeds, rendering it poisonous. Several significant instances of katkar poisoning have been reported in India, Fiji, South Africa and other countries. The last major outbreak in India occurred in 1998. 1% adulteration of mustard oil by argemone oil has been shown to cause clinical disease.

Source: en.wikipedia.org/wiki/Argemone_mexicana - 12.12.2011