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.
All four species are natives of Europe, two of them known in cultivation and the other two weeds.
1. Corolla ca. 19–26 mm long, the tube curved upward; plants perennial; leaves acute and all petioled.
2. Corolla white, the upper lip ciliate with long hairs (at least 0.5 mm) and usually pilose above as well; terminal tooth of largest cauline leaves prolonged or ± acuminate, often 9 mm or more long.
2. Corolla pink to purplish [albinos rare], the upper lip with hairs less than 0.5 mm; terminal tooth of largest cauline leaves less than 9 mm long.
1. Corolla ca. 9–19 mm long, the tube straight; plants annual; leaves acute to rounded in outline, all or only the lower ones petioled.
3. Leaves subtending flowers sessile, ascending or at most horizontal, slightly broader than long (± reniform in overall outline).
3. Leaves subtending flowers short-petioled, reflexed, the blade about as long as broad or a little longer.
All species found in Lamium
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023. https://michiganflora.net/genus.aspx?id=Lamium.