Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Walters
Roadsides, fields, and disturbed places. First collected in 1920 in Washtenaw Co.
Quite similar to A. officinalis, but with distinctively slender, long-attenuate calyx lobes. The bract subtending the flower is similarly shaped, while in A. officinalis it is more ovate-lanceolate.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 12, 2017. http://michiganflora.net/species.aspx?id=563.