Rydberg : Studies on the Rocky Mountain Flora 236 



conspicuously auricled at the base : racemes numerous : pedicels 

 short, in fruit scarcely more than 4 mm. long, diverging or even 

 reflexed : sepals bright orange, obtuse ; petals light yellow, 

 scarcely equalling the sepals and not quite i mm. long : fruit (im- 

 mature) 5-6 mm. long, slightly thicker at the base, abruptly con- 

 tracted into a minute style, not .5 mm. long. 



In general appearance, this species resembles most R. pahistris, 

 but it is more branched with divaricate branches, has much shorter 

 pedicels, rather longer and more tapering pod and not half as long 

 style. From R. obtusa, it differs in the shape of the leaves, which 

 are less dissected, the shorter style and general habit. The type 

 grew at an altitude of 3300 m. 



Colorado: Red Mountain, south of Ouray, 1901, L. M. Un- 

 derwood, 2gga. 



Roripa Integra sp. nov. 



Biennial, glabrous : stems few, strict, branched above ; basal 

 leaves not seen as they are fallen off in the type specimen ; stem- 

 leaves spatulate or rhombic spatulate, 1-2 cm. long, not auricled 

 at the base, entire or slightly sinuate : racemes slender, lax : petals 

 1.5 mm. long, scarcely exceeding the sepals; pedicels 1-3 mm. 

 long, ascending : pod about 8 mm. long, somewhat curved : style 

 about 5 mm. long. 



The type specimen is labelled Nasttirtmm pahistre var., but it 

 is not closely related to this species. It is nearer R. obtusa, but 

 differs in the entire leaves ; the more tapering and more curved 

 pod, the erect habit and the short style. It grows at an altitude 

 of about 2700 m. 



Utah: Wasatch Mountains, 1869, 5. Watson, 64, in part 

 (type in herb. Columbia University). 



Lesquerella arenosa (Richards). 



Vesicaria arenosa Richardson, Frankl. Journ. App. 743. 



Lesqncrella Lndoviciana var. arenosa S. Wats. Proc. Am. Acad. 

 23: 252. 



This is amply distinct from L. Lndoviciana (DC.) S. Wats, or 

 L. argentca (Pursh) MacM., by the more slender ascending stems, 

 the shorter leaves, the oblanceolate, instead of linear stem-leaves 

 and the comparatively larger and often somewhat ellipsoid pod. 

 The range given in the Synoptical Flora should be extended to 

 the Black Hills of South Dakota and northeastern Wyoming. 



