A western sp., often more erect, with shorter bracts not surpassing the cal, and with more conspicuous fls, the limb 3-5 mm wide, is intr. in Kings Co., N.Y.

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.