Rydberg : Studies on the Rocky Mountain Flora 280 



Colorado : Grand Junction, 1893, Alice Eastzvood (type). 

 Wyoming: Mount Leidy, 1897, F. Tweedy, ^gi . 



Cardamine cardiophylla sp. nov. 



Stem stout, 3—10 dm. high, densely hirsute with short white 

 hairs, almost pilose : leaves rounded-cordate or the lower reniform, 

 simple, coarsely sinuately toothed : blades 3—4 cm. broad, more 

 or less pubescent : petioles more or less densely pilose, those of 

 the basal leaves 5—8 cm. long, those of the upper stem-leaves 

 very short : sepals also pubescent, about 3 mm. long : petals white, 

 broadly spatulate, about 8 mm. long : pedicels in fruit spreading, 

 1.5—2 cm. long: pods 2.5—3.5 cm. long, ascending, 1.5 mm. wide. 



This species is nearest related to C. cordifolia, and differs 

 mainly in the thicker leaves and the dense pubescence. It reaches 

 an altitude of 3300 m. 



Colorado : Tennessee Pass, Lake County, 1900, Geo. E. 

 Osterhont, 2i'/8 (type); 1893, De Alton Saunders ; Camp beyond 

 Bent's Fort, 1845, Fremont, ^2g. 



Thlaspi Coloradense sp. nov. 



Perennial ; rootstock or caudex cespitose, the branches rosu- 

 liferous at the apex. Basal leaves broadly spatulate, 1-2 cm. long, 

 fleshy, 4—7 mm. wide, sinuately crenate or subentire : flowering 

 stems 2-8 cm. long, leafy : stem-leaves oblong or obovate, 3-10 

 mm. long, obtuse : inflorescence short and dense, even in fruit 

 seldom over 2 cm. long : sepals rounded-ovate, obtuse, with a 

 white margin, about 2 mm. long : petals large, obovate-spatulate, 

 5-6 mm. long : silicle obovate, about 6 mm. long, only slightly 

 emarginate at the apex : wing-margins very narrow ; carina on the 

 sides rather prominent : seeds red, about i mm. long. 



This species has been included by American authors in T. alpestre, 



which is not found in America. The European species has very 



small flowers and a different pod which is obcordate with a narrow 



and deep sinus at the apex. Professor Greene has determined T. 



Coloradense as T. Fendleri Gray. The latter was described from 



flowering specimens and might be the present species ; at least 



it is much like it. Specimens in fruit from the same region as the 



type of T. Fendleri were collected later and were referred by 



Dr. Gray to T. Fendleri ; in these the fruit is larger, decidedly 



inverted triangular in outline, broader margined at the corners and 



almost truncate at the apex. 



