What is "gentians"

Usage examples of "gentians".

Tufts of grass and moth-white gentians grew in the loess-filled cracks.

And then there were all kinds of sweet flowers growing on the rocks-- bright green moss with pale pink, starry flowers, and soft belled gentians, more blue than the sky at its deepest, and pure white transparent lilies.

Wild flowers were scattered through the woods, white trilliums, yellow violets, rose pink hawthorn, while yellow jonquils and blue and yellow gentians dominated some of the higher meadows.

A deep, velvety royal blue, not the sky blue of the Bavarian gentians Lawrence was describing.