237 Rydberg : Studies on the Rockv Mountain Flora 



Lesquerella Shearis sp. nov. 



Perennial with a large rosette of basal leaves ; stems several, 

 ascending, 1-2 dm. high, densely stellate : basal leaves 3—4 cm. 

 long ; blades broadly oval or ovate, entire or slightly angular den- 

 ticulate ; stem leaves oblanceolate, about 2 cm. long, subsessile : 

 raceme many-flowered ; pedicels in fruit bent S-shaped : pods erect, 

 densely stellate, 7—8 mm. long, acute, compressed above ; septum 

 elliptic in outline : style about as long as the pod. 



This species differs from L. curvipcs A. Nelson in the broad 

 basal leaves, the elliptic instead of ovate outline of the septum and 

 the longer style. It grows along creek banks at an altitude of 

 about 2000 m. 



Colorado: Idaho Springs, 1895, C. L. Shear, j26^ (type in 

 herb. N. Y. Bot. Gard.); also at the same locality, P. A. Rydberg. 



Physaria brassicoides sp. nov. 



A tufted perennial with a large and dense rosette of basal leaves 

 and a thick taproot : basal leaves large, with winged petioles ; 

 blades almost orbicular in outline, sinuate-dentate, 2.5-5 cm. in 

 diameter : stem leaves small and few, spatulate : flowering stems 

 about I dm. high, ascending : flowers numerous : fruit almost 

 obcordate, acute at the base, deeply divided above ; cells inflated, 

 rounded pyriform, 8—10 mm. long and 5—8 mm. in diameter: style 

 about 5 mm. long. 



This species resembles most P. didyiiiocarpa in habit, but differs 

 in the smaller fruit, which is not at all cordate at the base but on 

 the contrary usually acute, and in the larger basal leaves which 

 form a large rosette, 7— 10 cm. in diameter and having some resem- 

 blance to a young cabbage-head. It grows in crevices of magnesian 

 rocks in caiions and badlands. 



Nebraska : Caiion south of Scott's Bluffs, 1891, Rydberg, 24. 



Cardamine acuminata (Nutt.) 



Cardamine Jnrsitta {i acuminata Nutt.; T. & G. Fl. N. Am. i : 

 85. 1838. 



This species has been variously referred to C. Jnrsitta, C. obligo- 

 sperina, and C. Pennsylvanica. It is probably nearest related to the 

 last, but the lower part of the stem is hairy and the pod has an 

 evident style over i mm. long. It ranges from the Mackenzie 

 River to British Columbia, south to California and Wyoming. 



