Stems 4-6 dm; lvs lanceolate, 2-5 cm wide, deeply pinnatifid, the lance-oblong segments again shallowly pinnatifid; cal subequally 5-lobed, the lobes oblong, foliaceous, 4-6 mm, erose; cor yellow, 16-20 mm, the galea with 4 very short teeth near the tip. Banks of rivers, typically in fairly wet but well drained soil, along with Alnus viridis; St. John R. valley, Me. and N.B. July, Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
©The New York Botanical Garden. All rights reserved. Used by permission.