One of the most attractive and beautiful of these alpine flowers is the blue honeysuckle or polemonium, about an inch in height.    From Wordnik.com.  [Wild Life on the Rockies] Reference

The pretty pinnate leaves of the blue-flowered polemonium are sufficient explanation for the common name Jacobs-ladder, even though that name does not properly belong to our species.    From Wordnik.com.  [Some Spring Days in Iowa] Reference