Short-lived; stems 3-8 dm, mostly solitary, glabrous or nearly so, simple or few-branched; lvs mostly opposite, sessile or short-petioled, 5-10 cm, pinnately lobed less than half way to the midvein, each lobe crenate; spikes terminal and from the upper axils; cal 1 cm, very oblique, each lateral half bearing near its lower side a foliaceous, oblong or ovate, entire or crenate appendage; cor 15-25 mm, yellow, the galea about as long as the lower lip, truncate or very shallowly notched at the tip, otherwise entire. Swamps and wet soil; Mass. to Mich., Minn., and N.D., s. to N.C., Mo., and Neb. Aug., Sept.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.