Mexicana: Argemone

: Because of its striking yellow petals and blue-green foliage, it was intentionally brought to Hawaii as a decorative plant in 1934.

: It traveled as a contaminant in wheat shipments to New Zealand in the 1890s and Australia in 1845.

: By the early 19th century, it had already become one of the most widespread weeds on remote islands like St. Helena .