This is a large genus of over 150 species in North America, most of which are western, although a few are centered in the southeastern United States.
1. Stamens long-exserted (2–6 mm) beyond corolla, glabrous.
1. Stamens scarcely if at all longer than the corolla, the filaments hairy.
2. Corolla bell-shaped, with distinct tube, the lobes entire; range northern (Isle Royale).
2. Corolla nearly rotate (flat), the lobes fringed; range southern.
All species found in Phacelia
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 17, 2019. https://www.michiganflora.net/genus.aspx?id=Phacelia.