80 LEAFLETS. 



Arabis polyantha. Stout upright perennial a foot high 

 or more, the leaves and stem hoary with a short and dense 

 substellate tomentum ; basal leaves oblanceolate, more or less 

 dentate, 1 to 1/^ inches long; cauline leaves rather crowded, 

 all linear or lance-linear, revolute, sessile by an auricled base, 

 appearing (by virtue of strongly revolute margin upwards) 

 as if acuminate : flowers very numerous, forming an uncom- 

 monly thick and dense raceme, the rachis only sparsely stel- 

 late, but pedicels tomentulose, as are also the pale-green sepals 

 and even the forming pods ; petals nearly an inch long, appa- 

 rently white, or only pinkish. 



A. Rock Island, eastern Washington, 27 April, 1879, Kirk 

 Whited ; his n. 1043 as in U. S. Herb. 



The specimens are scarcely past full flowering ; the pedicels 

 are deflexed, and so doubtless are the pods, and these prob- 

 ably straight and narrow. 



Arabis setigera. Biennial or perennial, the stems mostly 

 solitary, rigidly erect, a foot high, glabrous ; rosulate basal 

 leaves % inch long, elliptic-lanceolate, scarcely petiolate, 

 glaucous, superficially glabrous but the whole margin closely 

 bristly-ciliolate, the bristles of the basal part of the leaf apt to 

 be simple, the others usually forked but not deeply so ; cauline 

 leaves few, short, appressed to the stem, sessile, scarcely 

 auricled, ciliolate like the basal : flowers not seen : fruiting 

 stems racemose from below the middle'; pods straight, closely 

 reflexed on very short pedicels, 2 inches long, more than a line 

 wide, acutish : seeds uniserial, narrowly winged at the sides, 

 broadly so at the summit. 



Corral Springs, Klamath Co., eastern Oregon, collected by 

 J. B. Leiberg 2 Aug., 1894; his n. 610 as to label in U. S. 

 Herb., on sheet 404,822. 



Arabis Dacotica. Biennial, perhaps more enduring, a foot 

 high and simple, from a single tuft of elliptic-lanceolate rather 

 slenderly petioled basal leaves, these an inch long or more, of a 

 pale bluish green, scarcely hoary, yet clothed on both faces 



