WBSTERN SPSCIES OF ARABIS. 71 



by Mr. Watson himself, and no other written in place of it. The 

 plant is certainly far removed from the group of A . platys- 

 pernia , and no one familiar with A. pulchra and with the 

 diverse aspect of things made congeneric with it, could fail to 

 see that, despite its erect pods, this is of that group. 



Though the Californian A . Breweri and its allies are greatly 

 at variance with T. pulchra in habit, their rather showy and 

 somewhat spreading purple petals indicate for them a place 

 not so far removed . Of this alliance are the three species next 

 following. 



Arabis Kenned yi. Subalpine low tufted slender peren- 

 nial 3 to 5 inches high, notably leafy up to the inflorescence 

 after the manner of A . Breweri, but more slender, the herb- 

 age delicate, scarcely canescent : leaves of sterile basal shoots 

 1 inch long, the obovate to oval blades narrowed to slender 

 petioles, both faces stellate, but loosely so ; cauline leaves 

 numerous, large, overlapping each other, spatulate-obovate to 

 oblong-ovate and oval, rarely with a tooth or two, sessile, 

 shortly auricled : rachis of the raceme glabrous, as also the 

 pedicels and pods, but calyx as much stellate as the foliage : 

 corolla small, deep purple: pods small and slender, 1 to 1>^ 

 inches long, very narrow, obtuse, straight or slightly curved, 

 horizontally extended or slightly deflexed : seeds uniserial, 

 flat, winged. 



Mountains of Washoe Co., Nevada, at 8,000 feet, along 

 Galena Creek, P. B. Kennedy, 1 Aug., 1906. 



Arabis rostei^lata. Low and multicipitous after the 

 manner of A . Breweri, but the stout lignescent caudex more 

 developed, commonly 2 inches above ground, the flowering 

 stems with their fruiting racemes 3 to 5 inches ; basal leaves 

 smaller, mostly /4 to }i inch long, spatulate-obovate, regularly 

 and evenly crenate- toothed, stellate superficially, the petiolar 

 part more or less bristly-ciliate ; cauline leaves ovate and 

 oblong-ovate or oval, obtuse sessile and clasping : raceme few- 

 flowered; flowers not small, deep purple, the thin sepals purple- 



