406 RvDBERG : Rocky Mountain flora 



Arenaria polycaulos sp. nov. 



Arenaria saxosa Coult. Man. 35, 1885, and Gray, Syn. Fl. i' : 

 240, in part ; not A. Gray, PI. Wright. 2 : 18. 



Perennial with a long tap-root, giving rise to numerous pros- 

 trate or spreading stems about i dm. long, slender, finely scabrous 

 puberulent ; leaves ovate or ovate lanceolate, spreading, about 5 

 mm. long, finely puberulent; pedicels 5-10 mm. long; sepals 

 ovate-lanceolate, short-acuminate, scarious-margined, 3—4 mm. 

 long ; petals 5—6 mm. long, obovate, entire. 



This plant has generally been known as A. saxosa, but the 

 type collected by Wright differs considerably from it, being sub- 

 ligneous at the base, with short erect stems, lanceolate almost 

 erect leaves and narrower sepals. A. polycaulos grows on dry 

 hills at an altitude of 2600-3000 m. 



Colorado: Silverton, 1898 (type; collector not given, but 

 specimens received from the Agricultural College of Colorado) ; 

 1895, Tweedy, ijj ; Mt. Harvard, 1896, y^. E. Clements, j^ ; Gray 

 Back Mining Camps, 1900, Rydberg & Vreeland, 62SS ; La Plata 

 P. O., 1898, Baker, Earle & 7 racy, 444; Dark Caiion, 1901, 

 Clements, iij ; Breckenridge, 1896, Shear, 4jjS and 4545. 



Arizona: Mt. Humphrey, 1883, Rusby, 531 ; 1897, R. E. 

 Knnze ; San Francisco Mts., 1892, Toniney, 48 j. 



Arenaria Tweedyi sp. nov. 



Perennial, densely cespitose with somewhat ligneous base ; 

 leaves fleshy, linear-filiform, 2-3 cm. lon^, less than i nmi. wide, 

 somewhat curved; stem usually less than i dm. high, glandular 

 puberulent especially on the inflorescence ; this an open cyme ; 

 bracts lanceolate, scarious-margined ; pedicels about i cm. long ; 

 sepals lanceolate, acute, about 5 mm. long, scarious-margined 

 and decidedly glandular puberulent ; petals about 8 mm. long. 



This is most nearly related to A. nintahejisis A. Nelson, differing 

 in the fleshy not pungent leaves and the more glandular puberu- 

 lent inflorescence. It grows in the mountains at an altitude of 

 about 3600 m. 



Colorado: La Plata Mountains, 1896, Erank Ticcedy. 



Arenaria Eastwoodiae sp. nov. 



Perennial with a cespitose base ; stems about 2 dm. high, per- 

 fectly glabrous; leaves filiform, stiff, pungent, 1-2 cm. long, 0.5 

 mm. wide, minutely scabrous-ciliolate on the margin below, dilated 



