The leaves are sometimes whorled at some nodes. The flower may appear to have a 2-lobed lower lip, the keel-like middle lobe obscured. The fruit is a spherical-ovoid capsule.
1. Corolla 5–8 mm long, the upper lip often at least partly blue; principal leaves 2–7 mm broad (widest at or beyond the middle); style 3.5–5 mm long; Upper Peninsula.
1. Corolla 10–17 mm long, the upper lip white; principal leaves 7–26 mm broad (widest below the middle); style (persisting on immature fruit) 8–11 mm long; southern Lower Peninsula.
All species found in Collinsia
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 9, 2021. https://michiganflora.net/genus.aspx?id=Collinsia.