130 ALSINACEAE. 



3. SAGINA L. PEAL-WORT. 



Basal leaves linear-filiform; petals shorter than the green sepals, i. S. saginoides. 

 Basal leaves subulate ; petals longer than the purple-tinged sepals. 



2. S. nivalis. 



1. Sagina saginoides (L.) Britton. (S. Linnaei Presl) In wet places, 

 among rocks and on brook-banks from Greenl. to Alaska, Que., Colo, and 

 Utah. Alt. 8000-10,000 ft. Twin Lakes; Grayback mining camps; La Plata 

 Post Office; headwaters of Clear Creek; Cameron Pass; Buffalo Pass; Em- 

 pire; Chambers' Lake. 



2. Sagina nivalis Fries. In arctic-alpine localities from Lab. to Alaska and 

 Colo. Alt. about 14,000 ft. Gray's Peak. 



4. MOEHRINGIA L. 



Leaves elliptic-oblong or oval, usually obtuse ; sepals obtuse or acutish ; stem terete. 



1. M. lateriHora. 

 Leaves lanceolate, acute ; sepals very acute or acuminate ; stem angled. 



2. M. macrophylla. 



1. Moehringia lateriflora (L.) Fenz. (Arenaria lateriHora L.) In wet places, 

 especially among bushes, from Lab. to Alaska, N. J. and Utah. Alt. 5000- 

 10,000 ft. Happy Hollow, Larimer Co. ; headwaters of Pass Creek ; Leroux 

 Creek, Delta Co.; Rifle, Garfield Co.; Stove Prairie; Walton Creek. 



2. Moehringia macrophylla (Hook.) Torr. (A. macrophylla Hook.) In wet 

 places, among bushes, from Lab. to B. C, Vt. and Calif. Alt. 10,000-12,000 

 ft. Red Mountain; Slide Rock Canon. 



5. ARENARIA L. SANDWORT. 



Leaves neither narrowly linear nor pungent. 



Plant low and spreading ; stem less than i dm. long ; leaves ovate or ovate- 

 lanceolate, less than i cm. long. i. A. polycaulos. 

 Plant taller ; stem 2-3 dm. long ; leaves oblong or linear-oblong, over i cm. long. 



2. A. confusa. 



Leaves narrowly linear, more or less rigid and pungent. 

 Sepals ovate to ovate-lanceolate. 



Inflorescence contracted and headlike. 3. A. congesta. 



Inflorescence more open. 



Flowers mostly subsessile in small glomerules at the ends of the branches 



of the very irregular cymes. 4. A. Burkei. 



Flowers all pedicelled in open regular cymes ; inflorescence more or less 



glandular. 

 Leaves distinctly pungent ; plant sparingly glandular-puberulent. 



5. A, uintahensis. 



Leaves more fleshy, hardly pungent ; inflorescence and calyx densely glan- 

 dular-pubescent. 6. A. Tweedyi. 

 Sepals narrowly lanceolate, acuminate. 

 Cymes open, not densely congested. 



Plant more or less glandular. 7. A. Fendleri. 



Plant perfectly glabrous. 8. A. Eastwoodiae. 



Cymes densely congested. 



Sepals 8-10 mm. long; stem leaves 2-3 cm. long. 9. A. pinetorum. 



Sepals 57 mm. long; stem-leaves 0.5-1.5 cm. long. 10. A. Hookeri. 



i. Arenaria polycaulos Rydb. (A. saxosa Coulter; not A. Gray) On dry 

 hills from Colo, to Ariz. Alt. 9000-10,000 ft. La Plata Post Office; Dark 

 Canon; Breckenridge ; Grayback mining camps; Mt. Harvard; Silverton. 



