156 SELECTED WESTERN FLORA 



36. CREPIS. Hawk's Beard. 



Heads few to many-flowered; involucre of a single row of prin- 

 cipal bracts and a few short outer ones ; pappus of many soft bristles. 

 Annuals or perennials with toothed or pinnatifid leaves and heads' of 

 yellow flowers terminating the branches of the somewhat naked 

 stem. 



1. C. runcinata, T. and G. 



Stem glabrous or nearly so, 1-2 ft. high, naked or with 1 or 2 small leaves ; 

 root leaves oblong to spatulate, entire or variously toothed; heads in a loose 

 corymb. Moist prairies, Man.-Alta. 



2. C. Slegans, Hook. 



Stems several or many from a single tap-root, diffusely branched; leaves 

 entire or nearly so, those from the root spatulate, those on the stems linear; 

 heads rather small; aohenes prolonged into a slender beak. Gravel beds 

 along rivers, Alta. 



3. < C. occidentMis, Nutt. 



Stem stout, 4-8 in. high, usually several from a stout perennial root, 

 branching above; leaves thickish, pinnately divided, tomentose when 

 young; head 10-30- flowered. Rocky Mts. 



4. C. giauca, T. and G. 



Perennial; stems scapelike, or seldom with 1 or 2 leaves, 8 in. -2 ft. high; 

 glabrous throughout; base leaves spatulate, entire or toothed; heads few, 

 on long peduncles. Alkaline soil, W. Man. and Sask. 



37. HIERACIUM. Hawkwebd. 



Heads usually large; corolla rays truncated, 5-toothed; recep- 

 tacle flat, almost naked; bracts in 1-3 rows, the outer smaller; 

 achenes variously shaped, and ribbed but never beaked; pappus 

 1 or 2 rows of firm, persistent, brownish bristles. Coarse perennial 

 herbs, usually branched, bearing rather showy heads of yellow or 

 orange flowers. 



1. H. canadSnse, Michx. Canadian Hawkweed. 



Stem stiff, erect, 1-4 ft. high, leafy, particularly towards the bottom, 

 slightly pubescent; leaves ovate to lanceolate, the upper reduced and clasp- 

 ing, the lowest sometimes petioled, serrate or toothed; heads numerous in 

 a sort of loose corymb; bracts in about 3 rows, the outer spreading; flowers 

 yellow ; pappus plentiful, brown. Moist prairies and about thickets, Man. 

 -Alta. 



