Description: English: Polemonium vanbruntiae Britton - Jacob's Ladder or Vanbrunt's polemonium, flowering plant. Date: scanned 2006-08-11 from 1980's photograph. Source: U.S. Fish and Wildlife Service, National Digital Library. Author: Barnes Dr Thomas G, U.S. Fish and Wildlife Service. Permission (Reusing this file): This file is in public domain, not copyrighted, no rights reserved, free for any use. You can use this picture for any use including commercial purposes without the prior written permission and without fee or obligation.