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Newfoundland west to MN, south to GA and AL.
Herbaceous perennial to 80 cm, the stem simple or branching above. Leaves opposite, linear to lance-ovate, serrate, to 15 cm long, sessile or on a very short petiole. Flowers white to greenish, sometimes pink, in terminal spikes 3-8 cm long.
Flowers July to September
Wetland indicator: Obligate
The name turtlehead refers to the shape of the flowers.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of
Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.
Michael Hough © 2004