COMPOSITE 137 



** Flo'wers not TELLO'W. 



39.'^Chicorium, flowers deep blue, pappus almost wanting. 



40. Lactuca, flowers blue or whitish, pappus plentiful. 



41. Lygodesmia, flowers rose-pink, stem almost leafless. , 



42. Prenanthes, flowers whitish qr purplish; leaves large, the upper 

 clasping. 



1. EUPATORIUM. Thoroughwokt. 



Flowers perfect; pappus a single row of bristles; corolla 5- 

 toothed; ■ achene 5-angled; heads 3-many-flowered. Perennial 

 herbs of somewhat rank growth, with glandular foliage and heads of 

 white or purple flowers in large eorymb-like clusters. 



1. E. purpureum, L. Joe-Pyewbed. 



Stem tall and stout, erect, simple; leaves oblong to lanceolate, 3-6 in a 

 whorl ; flowers purple, in large round- topped clusters raised above the leaves. 

 Marshes, Man.-Alta. 



2. LIATRIS. Blazing Star. 



Heads few to many-flowered; pappus of numerous, rather long, 

 often barbed bristles; corolla 5-lobed, the lobes slender; receptacle 

 naked. Perennial herbs with simple or but slightly branched 

 stems, usually from a globular corm or tuber, narrow entire leaves, 

 and heads of purple flowers in spikes or racemes. 



1. L. scaridsa, Willd. 



Pappus not very long and not barbed; stem rather stout, 6-18 in. high; 

 heads few, somewhat globular, involucre of several rows of purplish-margined 

 bracts. Dry soil about thickets, Man.-Alta. 



2. L. punctata. Hook. 



Stem rather stout, usually tufted, from a thick, often branching rootstock ; 

 pappus long and much barbed ; heads 4-6-flowered, in a dense showy spike. 

 Dry prairie, Man.-Alta. 



3. ANTENNARIA. Everlasting. 



Heads many-flowered, aU flowers tubular; involucre dry and 

 chaffy; pappus a single row of bristles. Woolly, dioecious, peren- 

 nial herbs with alternate stem leaves, and root leaves often forming 

 a mat. 



