Blue penstemon along the trail near Wildcat Creek

I will surmise that this is a blue form of Penstemon cobaea.  Compare it to the pale flowered Penstemon on the high slope pictured in the post of May 31.

http://clegggarden.blogspot.com/2015/05/introduced-wildflowers.html

This blue flowered Penstemon is found along the trail on the low lying ground near Wildcat Creek.  Photos taken June 13, 2015.

The nature, identification, and origin of the Penstemon at Clegg Garden needs further review.

Link to Penstemon cobaea: