Brassicaceae 1 1 7 



Other species of Draba occur in the region 

 but being neither common nor striking it is 

 deemed out of place to describe them 

 here. 



Thias i Decumbent or erect, 6-12 inches 



arvense L. high, simple or much branched 

 Penny-cress, above. Leaves spatulate or 

 oblong, obtuse, obtusely- or runcinately- 

 toothed or angled. Flowers small, white, 

 in a compact head; pods large, J an inch 

 broad, orbicular or nearly so, strongly winged 

 and compressed. 



In moist low ground and waste places 

 throughout the Rockies, flowering in June. 



Ph aria Densely stellate, canescent, pale 



didymo- green, root long and deep. Stems 



carpa decumbent or ascending, slender, 



simple, 3-12 inches long. Leaves 



A. Gray. 



Double spatulate, the basal ones ob- 



Bladder- tuse, entire or few lobed, nar- 

 pod. rowed into margined petioles; 



stem leaves nearly sessile, acute, much 



