Beardtongue

Nope.  That is not newly-fallen snow in the tall grass prairie.  It happens to be Smooth penstemon - Penstemon digitalis.

click on the flowers to enlarge

A native to the prairie it is commonly called beardtongue.  Native Americans and folk-healers have made us of this plant for medicinal purposes for both people and animals.

And when it blooms...BANG!  There it is.  And there is an abundance of this blooming beauty.  And then before too long the flowers are gone.