A distinctive genus of wetland plants.
1. Corolla bluish to purple; stems 4-angled; leaves pinnately veined (with lateral veins arising all along the midrib); stems and pedicels glabrous.
2. Leaves petioled; pedicels (even in fruit) shorter than the calyx.
2. Leaves sessile, ± clasping; pedicels longer than the calyx.
1. Corolla yellow; stems terete or many-ridged but not square in cross-section; leaves nearly or quite palmately veined (with lateral veins all near or at the base of the blade); stems and pedicels glabrous or pubescent.
3. Plant ± densely viscid-pubescent (with many hairs exceeding 0.5 mm); calyx lobes slightly unequal, half to fully as long as the tube; corolla nearly regular.
3. Plant glabrous or with minute, often gland-tipped hairs up to 0.5 mm long; calyx lobes very unequal, only the upper large one ever as much as half as long as the tube; corolla 2-lipped.
4. Corolla ca. 3–4.5 cm long, the throat nearly closed by the up-arching lower lip; style ca. 20–25 mm long; plant pubescent with minute eglandular hairs on calyx, pedicels, and stems.
4. Corolla 0.8–2.7 cm long, the throat open; style less than 14 mm long; plant glabrous or with minute usually glandular hairs (rarely as long as 0.5 mm).
5. Style ca. 3–5 (–6) mm long.
5. Style ca. (6–) 8–11 (–14) mm long.
All species found in Mimulus
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/genus.aspx?id=Mimulus.