281 Rydberg: Studies on the Rocky Mountain Flora 



T. Coloradciisc grows at an altitude of 2500 m. or more, among 

 rocks. 



Colorado: Bald Mountain near Pikes Peak, 1896, E. A. 

 Bessey (type) ; South Cheyenne Canon, Colorado Springs, 1900, 

 Rydberg & Vrecland, 6126 ; West Spanish Peak 61 2"] and 6128 ; 

 Pikes Peak, 1894, E. A. Bcsscy ; Pikes Peak and Baldy, 1896, 

 F. Clements; Pikes Peak and Tennessee Pass, 1893, Z?r Alton 

 Saunders ; Laramie County, 1893, C. S. Crandall, 60 ; Pikes Peak, 

 1 89 1, Dr. E. Penard, ^4. ; Arapahoe, 55 ; Los Pinos, 1899, C. F. 

 Baker; Cheyenne Mountain and Seven Lakes, 1896,^. A. Bessey. 



Thlaspi purpurascens sp. nov. 



Perennial with a tap-root crowned by a very short caudex and 

 a rosette of leaves ; flowering stems generally several, less than 

 I dm. high : basal leaves oval or broadly spatulate, 2—3 cm. long, 

 petioled, usually more or less sinuate-dentate : stem-leaves ovate, 

 obtuse, with a truncate base, closely sessile: sepals 2.5-3 ^nm. 

 long, oblong-oval, obtuse, purplish with broad white margins : 

 petals broadly spatulate, about 6 mm. long : silicle triangular- 

 obovate, distinctly winged above and with a very broad and shal- 

 low sinus at the apex, 7-8 mm. long. 



This species is closely related to the preceding and inter- 

 mediate forms are not lacking. The principal difference is in the 

 fruit, which in T. purpiirascens is comparatively broader, distinctly 

 winged and with a broad and open sinus at the top, almost trun- 

 cate and less keeled on the sides. The sepals in all specimens 

 seen are purplish and broader, the stem leaves are larger, more 

 ovate and usually with a truncate base, and the branches of the 

 caudex are very short. 



Arizona : 1876, E. Palmer, ^yi (type) ; San Francisco Moun- 

 tains, 1 88 1, H. H. Rnsby, 28 ; \%^'j,Dr. E. A. Mearns, 34 ; 

 Flagstafl", 1898, D. T. MacDougal, 228. 



Colorado : Headwaters of Sangre de Christo Creek, 1900, 

 Rydberg & Vreeland, 6123 ; Iron Mountain, 6124. 



Sophia glandulifera sp. nov. 



Biennial. Stem simple below, branched above, about 6 dm. 

 high, slightly grayish pubescent with branched hairs, decidedly 

 glandular-viscid above ; branches spreading, with upwardly curved 

 ends : leaves pubescent and viscid, bipinnately divided ; segmicnts 



