Rydberg : Rocky Mountain flora 437 



differs in the shorter pod and pedicels and the smaller flowers. 

 From 6". pinnata it differs in being nearly glabrous and by the 

 shorter pedicels and the erect pods. It grows on gravelly flats, 

 sandy plains and rocky hills, at an attitude of 1 300-2000 m. 



Wyoming : Wraith Falls, Yellowstone Park, 1899, Avoi Nelson 

 &Elias Nelson jjio (type in herb. N. Y. Bot. Gard.) ; Green Riv^er. 

 1895, Rydberg; Fort Steele, 1901, Tiveedy 447^ and 44S0 {?), 



Utah: Salt Lake City, 1884, Leonard 212. 



Arabis oreophila sp. nov. 

 Arabis Drununondii alpuia S.Wats. Bot. King's Expl. 17, in part. 



1871. 



Perennial with a more or less branched caudex ; stems 1-2 

 dm. high ; basal leaves numerous, broadly oblanceolate or spatu- 

 late, stellate-pubescent ; stem-leaves rather {&\x, lanceolate, slight- 

 ly auriculate-clasping ; sepals oblong, 3-4 mm. long, margined 

 with purplish, obtuse, glabrous ; petals 7-8 mm. long, yellowish- 

 white below, upper portion rose or purplish; pedicels 4—10 mm. 

 long, erect or ascending ; pods glabrous, 3-6 cm. long, slightly 

 arcuate, 2 mm. wide, acute, but beak obsolete ; seeds in 2-rows, 

 winged above and on one side. 



This species is nearest related to A. Lyallii S. Wats., and was 

 included therein, but differs in the broader and shorter basal leaves, 

 which are decidedly stellate, and in the pod which lacks a distinct 

 beak. It grows on the higher mountains at an altitude of 2500- 

 3500 m. 



Utah : Divide between Big Cotton-wood Canon and Heber 

 Valley, 1905, Rydberg & Carlton 66 y8 (type in herb. N. Y. Bot. 

 Garden, flowers and young fruit); Alta, 1879, Jones 124S (fr.) ; 

 Uintas, 1869, Walson 75 (fl.) 



W'yoming : Union Peak, 1894, A. N'elson looy (fl.) ; upper 

 Buffalo Fork, 1899, C. C. Curtis. 



Montana: Old Hollowtop, iSgy, Rydberg & Bessey {^.). 



Nfw York Botanical Garden. 



