Description: Pycnanthemum incanum var. incanum. Date: 20 February 2008. Source: USDA
[1]. Author: USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 3: 144. Permission(
Reusing this file): This image is not copyrighted and may be freely used for any purpose
[2].