1. 
   Jacob'S Ladder
   (Polemonium) This group of perennials and annuals are mostly natives to North America. They grow 1 to 2 feet in height and produce pretty flowers during the spring and summer. P. caeruleum, Jacob's Ladder or Greek Valerian, has medium to bright green leaves that are finely divided into 17 to 27 lanc...
   Found op http://www.botany.com/polemonium.html
   
   
2. 
   Jacob's ladder
   Jacob's ladder: see phlox.
   Found op http://www.infoplease.com/ce6/sci/A0914806.html
   
   

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