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 

 Caiion; Dillon Canon, Trinidad. 



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

 ft. — Red Rock Caiion ; 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, S 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.; 

 0. 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. ±. L. brachycarpa. 



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



I. 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. 



■^. 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. 



