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 {Wdits.) 'R.yAh.'} 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 

 Jefiferson; 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 Caiion. 



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. 



