246 EPILOBIACEAE. 



2. Pachylophus montanus (Nutt.) A. Nels. (Oenothera montana Nutt.) 

 On dry hills from Ass. and Ida. to Colo, and Nev. Alt. up to 7500 ft. 

 Mancos; Palisade; mesa across Gunnison River from Grand Junction; Elk 

 Canon; Dillon Canon, Trinidad. 



3. Pachylophus macroglottis Rydb. On hillsides in Colo. Alt. 5000-10,000 

 ft. Red Rock Canon ; Turkey Creek and tributaries ; foot-hills, Larimer Co. ; 

 Horsetooth Gulch; gulch west of Pennock's; Narrows, Poudre Canon; 

 Pennock's mountain ranch ; Dolores ; Manitou ; Hotchkiss ; Pike's Peak ; 

 butte, 5 miles southwest of La Veta; Cerro Summit; Arboles; Boulder. 



4. Pachylophus caulescens Rydb. On hillsides and river banks in Colo. 

 Alt. 4500-9000 ft. Palisade, bank of Grand River; Dolores. 



5. Pachylophus marginatus (Nutt.) Rydb. (Onothera marginata Nutt.; 

 O. idahoensis Mulford) On hills from Ida. and Ore. to Utah and Colo. 

 Glenwood Springs. 



6. Pachylophus hirsutus Rydb. On hillsides from Wyo. to N. M. and Utah. 

 Alt. 7000-10,000 ft. Empire; above Como, South Park; Pennock's moun- 

 tain ranch; Georgetown; South Park; Ruxton; near Mancos; Pike's Peak; 

 mountains between Sunshine and Ward. 



7. Pachylophus exiguus (A. Gray) Rydb. (Oenothera exigua A. Gray) 

 On plains from Colo, to N. Mex. Alt. 4000-5500 ft. Rocky Ford, bank of 

 Arkansas River; mesas near Pueblo; Garden of the Gods. 



7. LAVAUXIA Spach. 



Leaves strigose-canescent. i. L. brachycarpa. 



Leaves green, glabrous or puberulent with ciliate margins. 2. L. flava. 



1. Lavauxia brachycarpa (A. Gray) Britton. (Oenothera brachycarpa A. 

 Gray) On plains from Kans. and Colo, to Tex. and N. M. Alt. 4000-6000 

 ft. Loveland; Denver; west of Ft. Collins; Ft. Collins; Fossil Creek; north 

 of La Porte; Tobe Miller's ranch; Boulder. 



2. Lavauxia flava A. Nels. (Oenothera triloba S. Wats., in part; not Nutt.) 

 In valleys from Ass. and Ore. to Colo, and Calif. Alt. 5000-10,000 ft. 

 Leadville; North Park; Arboles; Egeria Park; headwaters of Sangre de 

 Cristo Creek; Grayback mining camps and Placer Gulch; near Parrott Post 

 Office; Rabbit-Ear Range; Table Rock; Leroux Creek; Steamboat Springs; 

 north of La Porte; Alamosa. 



8. GAURELLA Small. 



i. Gaurella guttata (Geyer) Small. (Oenothera canescens Torr.) On 

 dry plains from Neb. and Colo, to Okl. and N. Mex. Purgatory River. 



9. GALPINSIA Britton. 



i. Galpinsia lavandulaefolia (T. & G.) Small. (Onoethera lavandulae folia 

 T. & G.) On plains and prairies from Neb. and Wyo. to Tex. and Mex. 

 Alt. 4000-5500 ft. Mesas near Pueblo ; Grand Junction. 



