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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. 1. L. brachycarpa. 
Leaves green, glabrous or puberulent with ciliate margins. 2. L. Hava. 
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. 
1. Gaurella guttata (Geyer) Small. (Oenothera canescens Torr.) On 
dry plains from Neb. and Colo, to Okl. and N. Mex.—Purgatory River. 
9. GALPINSIA Britton. 
1. Galpinsia lavandulaefolia (T. & G.) Small. (Onoethera lavandulaefolia 
T. & G.) On plains and prairies from Neb. and Wyo. to Tex. and Mex.— 
Alt. 4000-5500 ft.—Mesas near Pueblo; Grand Junction. 
