Vermont to Maryland.
Flowers: loosely clustered in panicles. Calyx: five-lobed. Corolla: with five rounded lobes. Stamens: five, exserted. Pistil: one. Leajlets: opposite; ovate; almost sessile. Stem: erect; leafy to the top; glabrous. Rootstock: thick.
Prof. Britton, by whom this species was named, tells us that "it differs from the Old World Polemonium coeruleum in its stout rootstock, more leafy stem, exserted stamens, and rounded corolla lobes." It is a pretty feature of the swamps and is also found along slow streams.