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At the moment, the Issima team is “chasing an orange thistle,” Ms. Johnston said, referring to their work with the genus Centaurea, and Mr. Bowen admits to “fooling around with Epimedium for cut flowers.”

For example, marked reproductive incompatibility has developed in just 200 years between source populations of Centaurea plants in Spain and introduced populations of the same species in California.

At the base of the incline, bordered in the summer by golden fields of blooming Centaurea solstitialis flowers, was a little heart-shaped lake that you could see from my house.

A name given to several different species of plants having blue flowers, as the Houstonia c?rulea, the Centaurea cyanus or bluebottle, and the Vaccinium angustifolium.

In answer to the question, What is the bluest flower in the garden or field? one answered Fringed Gentian; another the Forget-me-not, which has much pink in its buds and yellow in its blossoms; another Bee Larkspur; and the others Centaurea cyanus or Bachelor's Buttons, a local American name for them, which is not even a standard folk name, since there are twenty-one English plants called Bachelor's Buttons.