706 SCROPHULARIACEAE 



40. Mimulus diffusus Grant. Mrs. Grant's Monkey-flower. Fig. 4560. 



Mimulus diffusus Grant, Ann. Mo. Bot. Card. 11: 254. 1925. 



Mimulus Grantianus Eastw. Bull. Calif. Acad. IV. 20: 153. 1931. The lobed-leaved form. 



Annual glandular-puberulent herb, the stems becoming much-branched and widely diffuse, 

 5-2.5 dm. tall. Leaf -blades oblong-lanceolate, entire to deeply and doubly dentate-lobed, 1-1.5 

 cm. long, sessile ; pedicels 25-45 mm. long ; calyx 5-7 mm. long, ridged or slightly wing-angled, 

 its lobes 0.5-1 mm. long, rounded-ovate, mucronate, eciliate; corolla 12-15 mm. long, purple, 

 throat campanulate, ventrally with 2 yellow puberulent sharp ridges and proximally with a con- 

 siderable yellow area, the orifice open, the lobes spreading, notched, and proximally pilose; 

 anthers glabrous ; stigmas fringed ; capsule 6 mm. long, dehiscing slightly through septum-apex. 



Moist sandy soil, Upper Sonoran Zone; San Jacinto Mountains of southern California to mountains of 

 northern Lower California. Type locality: Palomar, San Diego County, California. April-June. 



41. Mimulus exiguus A. Gray. Mean Monkey-flower. Fig. 4561. 



Mimulus exiguus A. Gray, Proc. Amer. Acad. 20: 307. 1885. 



Annual glandular-puberulent herb, the diffusely tenuous stems 0.5-0.7 dm. tall. Leaf -blades 

 oblong- lanceolate, entire or distally obscurely blunt-toothed, nearly veinless, 0.3-0.6 cm. long, 

 sessile; pedicels very slender, becoming 15-20 mm. long; calyx 2-2.5 mm. long, nearly plane, 

 its lobes about 0.5 mm. long, acutish ; corolla 2-2.5 mm. long, purple, the throat narrow, the 

 minute lobes only slightly opening (so that the flower is presumably self-pollinated) ; anthers 

 glabrous; stigmas entire; capsule 3 mm. long, only tardily dehiscing through septum-apex. 



Probably sandy soil, Upper Sonoran or Transition Zones; San Bernardino Mountains of southern Cali- 

 fornia, and in mountains of northern Lower California. Type locality: near Hanson's Ranch, in northern Lower 

 California. June-July. 



42. Mimulus pilosus (Benth.) S. Wats. Downy Mimetanthe. Fig. 4562. 



Herpestis pilosa Benth. Comp. Bot. Mag. 2: 57. 1836. 

 Mimulus exilis Dur. & Hilg. Journ. Acad. Phila. II. 3: 43. 1855. 

 Mimulus pilosus S. Wats. Bot. King Expl. 225. 1871. 

 Mimetanthe pilosa Greene, Bull. Calif. Acad. 1: 181. 1886. 



Annual villose herb, the erect stems 1-4 dm. tall. Leaf-blades oblanceolate or oblong, entire, 

 pinnately veined, 1-9 cm. long, narrowed to sessile bases; pedicels becoming 10-35 mm. long; 

 calyx 6-7 mm. long, plane, its lobes unequal, uppermost one longest, the upper lateral pair slightly 

 shorter, the lowest pair shortest and about as long as the calyx-tube; corolla 4-9 mm. long, 

 yellow, the throat tubular-cylindric, ventrally with 2 vestigial slightly hairy maroon-spotted 

 ridges, the lobes rounded and spreading, with a blackish maroon blotch to either side of base 

 of lowermost lobe ; anthers glabrous (but filaments distally minutely pubescent) ; capsule 4-7 

 mm. long, dehiscing distally through septum one-third to half the length. 



Gravelly bars and stream banks. Upper Sonoran and Transition Zones; Washington to Lower California, 

 east to Utah and Arizona. Type locality: California. April-Sept. 



43. Mimulus nudatus Curran. Bare Monkey-flower. Fig. 4563. 



Mimulus nudatus Curran ex Greene, Bull. Calif. Acad. 1: 114. 1885. 



Annual glabrescent herb, the erect stems 1-1.5 dm. tall, finely glandular-pubescent just 

 above nodes. Leaf-blades oblong-lanceolate, denticulate to proximally dentate-lobed, obscurely 

 palmately veined, 0.5-1.5 cm. long, narrowed to petioles longer than or the upper shorter than 

 the blades, the uppermost much smaller, linear and nearly sessile ; pedicels becoming 25-30 mm. 

 long; calyx 10-12 mm. long, plicate-angled, its lobes acute, the lower shorter than and up- 

 curving against the uppermost which is about 2 mm. long; corolla 15-20 mm. long, yellow, the 

 throat ventrally with 2 rounded upraised ridges that nearly close orifice, these and the raised 

 palate deeper yellow, densely hairy, and brown-spotted, lower lip with deflexed lobes, upper lip 

 shorter and paler, ascending-arched ; anthers glabrous ; stigmas fimbriate ; capsule 6 mm. long, 

 not dehiscing through septum-apex. 



Open gravelly places in coniferous forest. Upper Sonoran Zone; Lake County, northern California. Type 

 locality: Kelsey Mountain, Lake County, California. May-June. 



44. Mimulus laciniatus A. Gray. Cut-leaved Monkey-flower. Fig. 4564. 



Mimulus laciniatus A. Gray, Proc. Amer. Acad. 11: 98. (January) 1876. 

 Mimitlus Eisenii Kell. Proc. Calif. Acad. 7: 89. (August or later) 1876. 



Annual glabrescent herb, the erect stems 0.5-3.5 dm. tall, finely glandular-pubescent above 

 nodes. Leaf-blades oblong to nearly oval in general outline but usually strongly pinnatifid-lobed, 

 cut nearly to midrib and the segments sometimes dentate or lobed, all narrowed to petioled bases, 

 or the upper sometimes sessile; pedicels 15-45 mm. long; calyx becoming 8-10 mm. long, 

 strongly plicate-angled, its lobes acute, lower shorter than and upcurving against the uppermost 

 which is usually fully twice as long ; corolla 6-13 mm. long, yellow, the throat ventrally with 2 

 rounded upraised ridges that partially close orifice, these and the raised palate somewhat hairy 

 and brown-spotted or usually distally blotched, lower lip with deflexed-spreading lobes, upper 

 lip shorter and paler, ascending-arched ; anthers glabrous ; stigmas slightly fimbriate ; capsule 

 6 mm. long, not dehiscing through septum-apex. 



Moist rock crevices and stony soil, Canadian Zone; southern Sierra Nevada from Tuolumne County to 

 Tulare County, California. Type locality: South Fork of Merced River, Mariposa County, California. May- 

 Aug. 



