COMPOSITiE 



151 



covered with stiff prickly chaff which projects above the achenes 

 and malses the head rigid and spiny to the touch. Perennial herbs 

 with rather naked steins and large solitary ' heads with purplish 

 spiny disks and somewhat persistent rays. 



1. B. angustifSlia, Heller. 



Low and rough-hairy throughout; leaves lanceolate and strongly 3- 

 nerved; rays purplish, pink, or whitish. Dry prairie, S.W. Man. and S.E. 

 Sask. 



26. RUDBECKIA. Cone-Flowee. 



Heads many-flowered, radiate; ray-flowers neutral; disk-flowers 

 perfect; bracts of the involucre in 2-4 rows; receptacle conical, 

 covered with concave chafly scales which mix with 

 the tube-flowers; pappus a crown, or a few tpeth, or 

 none. Rough perennial herbs with alternate leaves 

 and large showy heads with yellow rays and dark, 

 mostly purple, disks. 



1. R. hirta, L. Black-eyed Susan. 

 Biennial, 1-2 ft. high, usually branching from near the 



Base, very rough throughout; leaves entire or nearly so, 

 the upper oblong, sessile, the lower spatulate, petioled; 

 heads with yellow rays and conical purplish-brown disks. 

 Dry soil, Man. and Sask. 



2. R. lacinata, L. 



Stem smooth, 2-6 ft. high; lower leaves large, long- 

 petioled, pinnately 5-7-parted, the lobes variously toothed ; 'p ,^ 7~ 



upper leaves 3-5-parted or the uppermost not divided; hirta 



heads on long peduncles, the disk rather hemispherical 

 at first, but becoming conical or columnar in fruit. Low thickets, Man. 



27. LEPACHYS. 



Heads many-flowered, radiate; rays rather few, reflexed, neutral; 

 bracts of the involucre few, spreading; receptacle long, columnar; 

 pappus none, or a couple of teeth. Perennial herbs with alternate 

 pinnately divided leaves, and showy heads, easily recognized by the 

 long columnar disk. 



1. L. columnaris, T. and G. 



Low, branching; disk often more than an inch long; rays yellow. (Var. 

 pulcherrima, T. and G., rays brownish-purple.) Both the type and the 

 variety occur. Dry prairies, Man.-Alta. 



