polemonium n 1: any plant of the genus Polemonium; most are low-growing often foul-smelling plants of temperate to Arctic regions
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]