1924] 
GRANT—A MONOGRAPH OF THE GENUS MIMULUS 171 
Ата. 521. 1901; Abrams, Fl. Los Angeles, 367. 1904, and ed. 2, 
337. 1917; Rydb. Fl. Rocky Mountains, 779. 1917. 
M. tenellus Nutt. ex Gray, Proc. Am. Acad. 11: 98. 1876. 
M. thermalis Nels. in Bull. Torr. Bot. Club 27: 269. 1900; 
Rydb. Fl. Rocky Mountains, 779. 1917. i 
M. longulus Greene, Leafl. Bot. Obs. & Crit. 2: 4. 1909. 
M. Langsdorfii var. microphyllus Nels. & Macbr. in Bot. Gaz. 
61:44. 1916. 
M. puncticalyx Gdgr. in Bull. Soc. Bot. Fr. 19: 219. 1919. 
; stem erect, 3-25 cm. high, mostly simple, slender, 
glabrous or pubescent, 4-angled; internodes long, leaves few, 
thin, orbicular or broadly ovate, 1-3.5 em. long, 1-1.5 cm. wide, 
obtuse, denticulate to irregularly dentate, sometimes lyrate or 
with the margins nearly entire, lower leaves with petioles nearly 
as long as the blade; flowers solitary or in a short raceme, pedicels 
slender, frequently recurved when mature; calyx campanulate, 
often dotted or tinged with red, glabrous or puberulent, sub- 
globose in fruit, 5-12 mm. long, 4-8 mm. wide, teeth short, 
broadly deltoid, obtuse or acute, the upper tooth about twice as 
long as the others, throat much constricted, giving an elliptical 
appearance; corolla from 11% to 3 times the length of the calyx; 
style glabrous; capsule stipitate. 
Distribution: in wet places in the mountains from Wyoming 
and Idaho to Washington, south to California. 
pecimens examined: 
Wyoming: on geyser formations, Upper Geyser Basin, 3 Aug., 
1899, Nelson & Nelson 6285 (M and R. Mt.); Upper Geyser, 
Yellowstone Park, without date, Broadhead (M); Mineral Hot 
Springs, Yellowstone Park, July, 1904, Oleson 15 (R. Mt.); 
Fire Hole, Yellowstone Park, July, 1904, Oleson 22 (R. Mt.); 
on the “formations” and frequent in Yellowstone Park, 
16 July, 1912, Churchill (M). 
Idaho: gravelly wet places, Squaw Butte, Canyon Co., 3500 ft. 
alt., 29 May, 1910, Macbride 143 (R. Mt.); margins of hot 
sulphur spring bogs, Ketchum and Guyer Hot Springs, 22 July, 
1911, Nelson & Macbride 1278 (R. Mt.); very moist meadow 
east of Bennington, 4 Aug., 1913, Schoper 17 (R. Mt.). 
Nevada: King’s Cafion, Ormsby Co., 11 June, 1902, C. F. Baker 
1058 (M, R. Mt., and Pomona). 
