Boltonia asteroides (L.) L’Hér.
Coefficient of Conservatism: 5
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb

Occurring mostly south and west of Michigan, but presumably native in the extreme southern part of the state, where it was first collected in 1905 in Cass Co. (H. S. Pepoon 433, MSC).

Many records in southeast Michigan, especially those from Wayne Co., were from somewhat disturbed, more or less urban settings, but it seems now to be concentrated in Monroe Co., near Lake Erie, where it was first collected in 1910 (O. A. Farwell 2184, GH). There its abundance fluctuates greatly from year to year. After exposure of moist ground, even former agricultural fields, following flooding, bushy plants as tall as 2 m may dominate for a year or two, soon to die out, presumably succumbing to competition and/or increasing dryness. It is likely to be found with Penthorum sedoides, Echinochloa walteri, Ammannia robusta, Bidens spp., Helenium autumnale, Juncus torreyi, and other plants of marshy mudflats.

The yellow disk and pink rays make this an attractive species, and indeed it is sometimes cultivated, often as a form with white rays.


Cass County
Monroe County
Wayne County


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