Symphyotrichum robynsianum (J. Rousseau) Brouillet & Labrecque
Synonym: Aster longifolius
Coefficient of Conservatism: 9
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb

Symphyotrichum robynsianum A. A. Reznicek

Aster longifolius of Michigan Flora.

Moist open sandy, gravelly, or rocky ground, including shores, limestone alvars, seasonally wet glades and swales as on outwash plains with jack pine; calcareous river banks, rock shores of Lake Superior.

This northern species, ranging west only to Wisconsin, has not been widely (or accurately) recognized. The leaves are indeed long, usually overtopping most or all of the inflorescence. Some plants with the long, narrow, clasping leaves and conspicuous blue rays of this species have the phyllaries ± imbricate, the outer ones distinctly shorter than the inner, rather than subequal. These may represent hybrids.


Chippewa County
    Including Drummond Island
Crawford County
Delta County
Keweenaw County
    Only on Isle Royale
Luce County
Mackinac County
Menominee County
Missaukee County
Oceana County
Roscommon County
Schoolcraft County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 22, 2021.