Wordnet 3.0
NOUN (1)
1. 
 any plant of the genus Polemonium; 
 most are low-growing often foul-smelling plants of temperate to Arctic regions; 
The Collaborative International Dictionary of English v.0.48:
Polemonium \Pol`e*mo"ni*um\ n. [NL., fr. Gr.? a kind of plant.]
   (Bot.)
   A genus of gamopetalous perennial herbs, including the
   Jacob's ladder and the Greek valerian.
   [1913 Webster]
WordNet (r) 3.0 (2006):
polemonium
    n 1: any plant of the genus Polemonium; most are low-growing
         often foul-smelling plants of temperate to Arctic regions