Lyall's Rockcress - Boechera lyallii
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Common in open, rocky places on slopes and banks, as well as occasionally on river gravels, between 2000 and 5000 feet. White flowers are sometimes seen. Photographed (left) at the Paradise Glacier overlook on August 29, 2014, and (center and right) on the Crystal Mountain ridgeline on August 8, 2014.