SCROPHULARIACEAR (FTGWORT FAMILY) 203 



MIMULUS (MONKEY FLOWER) 



Flowers either solitary in the leaf axils or in terminal racemes. Calyx 

 tubular, persistent, upper tooth usually largest. Corolla irregular to nearly 

 regular ; tube cylindric ; limb 2-lipped ; upper lip 2-lobed ; lower 3-lobed. 

 Stamens 4, 2 shorter. Stigma 2-lobed. Capsule obtuse, not exceeding the 

 calyx. (Gk. mimo = an ape ; from the grinning corolla.) 



A. Flowers yellow. 



B. Leaves with 3 or more veins from the base. 

 C. Stems leafy, not scapose, rarely only i -flowered. 

 D. Corolla 25-50 mm. long; calyx shorter than the corolla, its lobes equal or 



unequal. 



E. Plant not viscid-hairy. 



F. Plants 15-60 cm. high, without rhizomes; stems more than i -flowered. 

 G. Leaves oblong to orbicular; plant glabrous throughout or pubescent to 

 puberulent in the inflorescence; capsule oblong; seeds oblong. W. C. E. 



M. langsdorfii 



GG. Leaves oblong-lanceolate; plant glabrous throughout; capsule obovate; 

 seed obovate. W. M. scouleri 



FF. Plants 2-4 cm. high, with rhizomes; stems mostly i-flowered. C. 



M. alpinus 

 EE. Plant viscid-hairy, 10-20 cm. high, with rhizomes. W. E. 



M. implexus 



DD. Corolla 8-16 mm. long; calyx shorter than the corolla, its lobes unequal. 

 H. Stems stout, 4-angled, branching from the base. W. C. E. M. nasutus 



HH. Stems slender, terete, mostly simple. E. M. microphyllus 



DDD. Corolla 4-6 mm. long; calyx longer than the corolla, its lobes nearly equal. 

 E. M. breviflorus 



CC. Stem leafless, scapose, i-flowered. C. E. ' M. primuloides 



BB. Leaves with only i vein from the base. 



I. Calyx 5-angled, s-toothed. 

 J. Corolla 20-25 mm. long. 



K. Plant not viscid; hairy lines inside the corolla extending to its base; seed 

 ovate. W. M. dentatus 



KK. Plant viscid; hairy lines inside the corolla not extending to its base; seed 

 spherical. W. C. E. M. moschatus (MUSK FLOWER) 



JJ. Corolla 4-20 mm. long. 

 L. Plant villous with spreading white hairs, prostrate or spreading. E. 



M. floribundus 



LL. Plants glabrous or puberulent, not villous, erect (except M. alsinoides). 

 M. Calyx teeth distinctly unequal, 2 larger; lower lip of corolla with bright 

 crimson spot in center. W. C. E. M. alsinoides 



MM. Calyx teeth equal or very nearly so; corolla without crimson spot. 

 N. Leaves with wide petioles; corolla 10-20 mm. long. 



O. Calyx cylindric in fruit; capsule oblanceolate. E. M. peduncularis 



OO. Calyx distended in fruit; capsule oblong. E. M. pulsiferea 



NN. Leaves sessile but narrowed at base; corolla 6-8 mm. long. C. E. 



M. rubellus 



II. Calyx not angled, s-cleft; corolla 6-8 mm. long, under lip usually with a pair of 

 brown spots. E. M. pilosus 



AA. Flowers pink or red or purple. 

 P. Corolla 5-10 mm. long; stigma 2-lipped. 



