EPILOBIACEAE. 245 



2. Anogra albicaulis (Pursh) Britton. (Oenothera pinnatifida Nutt.) On 

 hillsides from N. D. and Mont, to Tex. and Sonora. Alt. 4000-7000 ft 

 Denver; Ft. Collins; Rist Canon; river-bluffs north of La Veta; Cucharas 

 Valley near La Veta ; Larimer Co. ; McElmo Canon ; Purgatory River, Trini- 

 dad; Horsetooth Gulch; Palisades; Grand Junction, mesa across Gunnison 

 River; Boulder; Ft. Collins. 



3. Anogra rhizomata A. Nels. In sandy soil in Wyo. and Colo. Alt. about 

 7500 ft. Gunnison. 



4. Anogra Nuttallii (Lindl.) A. Nels. (O. Nuttallii Lindl.) In sandy soil 

 from Minn, and Ida. to Colo. Alt. 4000-9000 ft. Denver; La Porte; Fossil 

 Creek, Larimer Co.; Grizzly Creek; Manitou; Table Rock; Baxter's ranch; 

 Colorado Springs; Boulder; Buena Vista; Ivy wild. 



5. Anogra Vreelandii Rydb. In canons of Colo. Alt. about 6000 ft 

 McElmo Canon. 



6. Anogra cinerea Rydb. In dry soil from western Neb. and Wyo. to Colo. 

 Denver; between Bent's Fort and Pueblo. 



7. Anogra latifolia Rydb. (Oenothera pallida latifolia Rydb.) On sandy 

 soil from Neb. to Colo, and Kans. Alt. 4000-10,000 ft. Gunnison; Marshall 

 Pass; Sterling, Logan Co. 



8. Anogra coronopifolia (T. & G.) Britton. On prairies and plains from S. 

 D. and Wyo. to Kans. and N. M. Alt. 4000-9000 ft. Cheyenne Mountain; 

 Moon's ranch, Larimer Co. ; plains west of Ft. Collins ; Denver ; Clear Creek 

 Station; along the Platte; Pike's Peak; Idaho Springs; Piedra; Mancos; 

 Cucharas River below La Veta ; Gunnison ; Manitou ; Buena Vista ; Palmer 

 Lake ; Grayback mining camps and Placer Gulch ; North Park ; Spring 

 Canon; Baxter's ranch; road to Soldier Canon; vicinity of Pine Grove; 

 Estes Park ; Boulder ; Como ; Hayden. 



6. PACHYLOPHUS Spach. 



Plant glabrous. i. P. caespitosus. 



Plant more or less hairy. 



Hypanthium, calyx and fruit glabrous, slightly strigose or with a few scat- 

 tered long hairs. 

 Tube of the hypanthium 3-6 cm. long ; pubescence (except on the margins 



of the leaves) short and usually appressed. 2. P. montanus. 



Tube of hypanthium 612 mm. long. 



Plant acaulescent, cespitose ; pod short conic-ovoid, with very thick ridges. 



3. P. macroglottis. 

 Plant more or less caulescent ; pod elongated conic-ovoid, with low ridges. 



4. P. caulescens. 

 Hypanthium, calyx and fruit densely hirsute. 



Pod stipitate. 5. P. marginatus. 



Pod sessile. 



Plant acaulescent ; ridges of the fruit slightly tuberculate. 



6. P. hirsutus. 



Plant more or less caulescent ; ridges of the fruit with lobed, more or less 

 foliaceous crests. 7. P. exiguus. 



i. Pachylophus caespitosus (Nutt.) Raim. (Oenothera caespitosa Nutt.) 

 On dry hills from N. D. and Wyo. to Colo, and Utah. Alt. 4000-9000 ft 

 Grizzly Creek; foot of Horsetooth Mountain. 



