[Beardtongues and Penstemons: The Genus Penstemon in the Cascade Mountains of Oregon and Washington]

A close-up of the clustered inflorescence and upper stem leaves as well as the habit of rydberg's penstemon as seen at the Conrad Meadows trailhead, Wenatchee National Forest.........June 28, 2013.

Rydberg's penstemon as seen along an old pack trail that steeply ascends to the northwest from the uppermost part of the South Fork Tieton River Trail #1120, Goat Rocks Wilderness........July 21, 2016.