76 LEAFLETS. 



Arabis multiceps. Perennial, with deep tap root bearing 

 above ground a much and fastigiately branched caudex, its 

 branches stout, naked below, leafy at summit, the whole 

 caudex 2>^ inches high, 3}^ inches in breadth: leaves very 

 firm, entire, glaucescent, the oblanceolate blade passing grad- 

 ually to a stout petiole of its own length, the whole without 

 trace of pubescence of any kind : flower stems scapif orm , 4 to 

 6 inches high, with an oblong sessile bract or two near the 

 base, bearing above the middle 4 to 7 straight linear abruptly 

 acute pods lj4 inches long, 1 line wide : seeds in one row, 

 rather remote, winged. 



Mt. Thielson, Cascade Range, Oregon, 6 Aug., 1897, Coville 

 and Applegate; their n. 435 as in U. S. Herb. 



Arabis densa. Low and compact, above the single tap 

 root formed into a thick leafy tuft 2 inches high, 3 in breadth, 

 the partly hypogeous and denudate branches thick, scaly with 

 imbricated bases of leaves of former seasons ; the crowded and 

 upright leaves oblanceolate, entire, less than 1 inch long, firm, 

 green, glabrous : flowering stems barely 1 inch high : flowers 

 unknown: pods only 1 or 2, erect, straight, 1/^ inches long, 

 little more than a line wide, acute, glabrous : seeds in 1 row, 

 orbicular, broadly winged. 



On Eagle Cap, at 9,000 feet, in the Imnaha National Forest, 

 Oregon, collected by A. W. Sampson and G. A. Pearson, 14 

 Sept., 1907. A low and almost pulvinately dense ally of A. 

 platysperma, the pods extremely narrow for this group, but 

 gradually pointed as in all this alliance. 



Arabis dianthifolia. Perennial, woody at base, the 

 usually solitary stems of the season 4 to 10 inches high : 

 leaves few, the basal and cauline not dissimilar, all small for 

 the plant, and upright, Va inch long and less, of rather hard 

 texture, oblong-lanceolate, acute, entire, to the unaided eye 

 glabrous, glaucescent, under a lens seen to be minutely and 

 rather closely ciliolate with short deeply forked hairs, also beset 

 superficially with small sessile pellucid glands : pods closely 

 deflexed, \% to 2 inches long, 2 lines wide, acute, the valves 



