With the fls all normally developed, borne in dichasia at the ends of the stem and branches, the filaments glabrous, is occasionally intr. (from s. and w. Europe) in our range, but apparently does not persist.

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.