1) Herb 2) Herbaceous plant 1) Skunkweed 
Polemonium, commonly called Jacob`s ladder, is a genus of between 25 and 40 species of flowering plants in the family Polemoniaceae, native to cool temperate to arctic regions of the Northern Hemisphere. One species also occurs in the southern Andes in South America. Many of the species grow at high altitudes in mountains. Most of the uncertainty....
• (n.) A genus of gamopetalous perennial herbs, including the Jacob`s ladder and the Greek valerian.
(Greek Ladder, Jacob's Ladder) 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 lance-shaped leaflets. In the summer...
Pol`e·mo'ni·um noun [ New Latin , from Greek ... a kind of plant.] (Botany) A genus of gamopetalous perennial herbs, including the Jacob's ladder and the Greek valerian. 
[n] - any plant of the genus Polemonium
noun any plant of the genus Polemonium; most are low-growing often foul-smelling plants of temperate to arctic regions