ALSINACEAE. 131 



2. Arenaria confusa Rydb. (A. saxosa Robinson, in part) In sandy soil 

 from Colo, to N. M. and Ariz. Alt. 7500-12,000 ft. Ouray; Wahatoya Creek; 

 near Pagosa Peak ; La Plata Mountains ; Mancos. 



3. Arenaria congesta Nutt. On dry plains from Mont, to Wash., Colo, and 

 Calif. Alt. 7000-10,000 ft. Oak mesa, Delta Co.; Little Muddy Creek, Gun- 

 nison Co.; Twin Lakes; North Park; along the Michigan; Middle Park; 

 Ouray; Cimarron. 



4. Arenaria Burkei Howell. (A. subcongesta (Wats.) Rydb.) On plains and 

 hills from Mont, to Colo, and Nev. Alt. about 8000 ft. Hills about Box 

 Canon, west of Ouray; Willow Creek, Routt Co. 



5. Arenaria uintahensis A. Nels. Dry plains from Mont, and Ida. to Colo, 

 and Calif. Alt. about 8000 ft. Mesa on the Gunnison River; Grand Junction. 



6. Arenaria Tweedyi Rydb. On dry mountains of Colo. Alt. about 12,000 

 ft. La Plata Mountains. 



7. Arenaria Fendleri A. Gray. On dry hills and mountains from Wyo. to 

 N. M. and Ariz. Alt. 7000-13,500 ft. Mountains between Sunshine and 

 Ward; Crystal Park; Stage Coach Mountain; butte 5 miles southwest of 

 La Veta; Callian; Cascades, near Pike's Peak; Sangre de Cristo Creek; Cam- 

 eron Pass; Crystal Lake; Colorado Springs; Caribou; headwaters of Clear 

 Creek; Gray's Peak; Dillon Canon; vicinity of Como; Leroux Creek; Cam- 

 eron Pass ; Moon's ranch ; Wood's ranch ; mountains between Steele's and 

 Little Beaver ; Graymont ; West Cameron Pass ; South Park, southeast of 

 Jefferson ; Monument ; Campton's Pass ; Ethel Peak. 



Arenaria Fendleri Porteri Rydb. On dry mountain ridges of Colo. 

 Alt. 7000-13,500 ft. Mount Ouray; Pike's Peak; Alpine Tunnel; mountains 

 west of Como ; South Park, southeast of Jefferson ; Silver Plume ; George- 

 town; Stephan's Mine; divide between Colorado Springs and Denver; Estes 

 Park, Larimer Co.; Pike's Peak; Little Kate Basin, La Plata Mountains; 

 West Spanish Peak ; La Plata Post Office ; north of Cheyenne Canon ; Em- 

 pire; Berthoud Pass. 



Arenaria Fendleri diffusa Porter & Coulter. On dry mountains of Colo. 

 Alt. 5000-10,000 ft. Mountains between Steele's and Little Beaver ; Como ; 

 Mt. Harvard; Green Mountain Falls; Georgetown; Cheyenne Mountain; 

 Middle Park; Boulder. 



8. Arenaria Eastwoodiae Rydb. (A. Fendleri glabrescens Wats.?) On dry 

 hills in western Colo. Grand Junction. 



9. Arenaria pinetorum A. Nels. On dry hills from S. D. to Ida., Neb. and 

 Colo. Livermore, Larimer Co. ; Cedar Hills ; Owl Canon. 



10. Arenaria Hookeri Nutt. On dry hills from Mont, to Nebr. and Colo. 

 Alt. 4000-7000 ft. Larimer Co. ; Cedar Hills. 



6. ALSINOPSIS Small. SANDWORT. 



Sepals acute or acuminate. 



Petals 6-7 mm. long, much exceeding the sepals. i. A. macrantha, 



Petals small, scarcely exceeding the sepals. 



Plant densely glandular. 2. A. propinqua. 



Plant glabrous or nearly so. 



Leaves linear-subulate, usually over i cm. long, i -nerved, obtuse, more or 

 less triangular, fleshy. 3. A. Rossii. 



