248 EPILOBIACEAE. 



Stipe-like base slender ; fruit fusiform ; tall herbaceous plants. 



3. G. coloradensis. 

 Stipe-like base thick ; body of the fruit pyramidal-ovoid ; low plants with 



subligneous base. 

 Plants more or less pubescent. 



Stem hirsute as well as strigose, at least below. 4. G. coccinea. 



Stem merely strigose or glabrous below. 



Leaves canescent, the lower usually oblong and sinuately toothed. 



5. G. margin at a. 



Leaves sparingly strigose ; all linear and entire. 6 G. parvifolia. 

 Plant glabrous or nearly so, except the strigose hypanthium. 



7. G. glabra. 



1. Gaura parviflora Dougl. In valleys from S. D. and Wash, to La. and 

 Ariz. ; also Sonora. Alt. 4000-7000 ft. Colorado Springs ; Cucharas Valley, 

 near La Veta; Durango; Ft. Collins; William's Canon; Deer River; along 

 the Platte River; Boulder. 



2. Gaura neo-mexicana Wooton. In valleys of Colo, and N. M. Alt. about 

 7000 ft. Pagosa Springs ; Piedra. 



3. Gaura coloradensis Rydb. On hills of Colo. Alt. about 5000 ft. Ft. 

 Collins; east of Poudre and east of College. 



4. Gaura coccinea Nutt. On plains and prairies from Mont, to Tex. and 

 Ariz. Alt. 4000-5500 ft. Denver ; Pike's Peak ; New Windsor, Weld Co. ; 

 mesas near Pueblo; Ead's; Ft. Collins; Quimby ; Ouray; Platte River. 



5. Gaura marginata Lehm. On plains and prairies from Man., Sask. and 

 Mont, to Kans. and Colo. Alt. 4000-6000 ft. Ft. Collins; W r alsenburg. 



6. Gaura parvifolia Torr. On dry plains of Colo, and N. M. Alt. 4000- 

 7000 ft. Durango; Pueblo; Colorado Springs; Ft. Collins. 



7. Gaura glabra Lehm. On plains from S. D. and Mont, to Colo, and Ariz. 

 Alt. 4000-8000 ft. Trail Glen; Gunnison ; Ft. Collins; Durango; Boulder. 



16. CIRCAEA L. ENCHANTER'S NIGHTSHADE. 



Plant 1-2 dm. high; leaves sharply dentate, usually cordate at the base 



i. C. alpina. 



Plant 3-6 dm. high ; leaf-blades sinuately denticulate, usually truncate or rounded 



at the base. 2. C. pacifica. 



1. Circaea alpina L. (C. pacifica Coulter; not Aschers. and Magn.) In 

 moist woods from Lab. and Alaska to Ga. and Colo. Alt. 7000-8000 ft. 

 Green Mountain Falls ; Estes Park, Larimer Co. ; foot-hills, Larimer Co. ; 

 gulch, Soldier Canon ; vicinity of Pine Grove ; Stove Prairie Hill ; Rist 

 Canon ; Bosworth's ranch, Stove Prairie. 



2. Circaea pacifica Ach. & Magn. In wet woods from Mont, and Wash. 

 to Colo, and Calif. Locality not given; probably doubtful. 



Family 97. GUNNERACEAE Endl. WATER MILFOIL FAMILY. 



Stamen i; ovary i-celled; leaves entire. i. HIITURUS. 



Stamens 4-8 ; ovary 4-celled, splitting into 4 nutlets ; at least the submerged 

 leaves pinnatifid. 2. MYRIOPHYI.LUM. 



