Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, will point to this new site.

The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

Sisyrinchium atlanticum E. P. Bicknell
Coefficient of Conservatism: 9
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb
Status: T

Very local in sandy, moist fields and moist sandy shores.

The peduncles are generally strongly geniculate at the base, as are most of the spathes also.

This is a coastal plain disjunct, and may be confused with the similar Sisyrinchium strictum, which, however, has the stems minutely denticulate on the margins as in S. angustifolium.

The Midland Co. record mapped in Michigan Flora, Vol. 1 was based on a rare specimen of Sisyrinchium mucronatum with a branched inflorescence.


Allegan County
Berrien County
Muskegon County
Newaygo County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 30, 2023.