1 20 Brassicaceae 



On banks and stony slopes throughout 

 the Rockies; flowering in June. 



Slightly glaucous, stems erect; 



... 1-2 feet high. Root leaves 

 Drummondn 



A. Gray. narrowly oblanceolate more or 

 Drum- less hairy; the stem leaves 



monds oblong or linear-lanceolate, 1-2 



Rock-cress. . ' 



inches long. Flowers white or 



pinkish, \ of an inch long in a close panicle, 

 elongated in fruit; pods erect when mature, 

 slender, 1^-3 inches long, obtuse. 



In open ground and on slopes throughout 

 the Rockies, flowering in June. 



Arabis Low, smooth, throughout, or 



Lyallii sometimes more or less stellace- 



S. Wats. pubescent below; stem simple, 



Lyall s several, or many from the same 



Rock-cress. 



root. Lower leaves spatulate 



or linear-oblanceolate, usually J-i inch long, 

 sometimes longer; stem leaves narrowly 

 lanceolate or oblong, sometimes scarcely 

 auricled. Flowers rose-colour, \ of an inch 



