Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net 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.

1. Terminal inflorescence densely crowded, compact, the long bracts with prolonged spine-tipped teeth; calyx mostly 10 mm or more long.

D. parviflorum

1. Terminal inflorescence elongate after flowering, the small bracts scarcely if at all exceeding the pedicels, entire, spineless; calyx ca. 6–8 mm long.

D. thymiflorum