|Draba sp. growing in tufa|
For good photos of Draba, I contacted Tony Reznicek, whose small lot off Pontiac Trail hosts more botanical genetic diversity per square foot than anywhere else on the planet. He also takes excellent photographs (all of which were shot within the last few days).
The final (modest) photo is my own, of Draba sibirica. Unlike the others, it is not a clump-former. In my garden it has lasted for more than a decade, slowly spreading horizontally without a care in the world.