228 FOUNDATIONS OF BOTANY 



Corollas yellow. 



Akenes truncate ; pappus double, of chaff and bristles. 



Krigia, XII. 



Akenes columnar ; pappus of tawny, rough bristles ; stem 

 scape-like. Ilieracium, XIV. 



Akenes spindle-shaped, not beaked; pappus of plumed 

 bristles. Leontodon, XV. 



Akenes ovoid to spindle-shaped, long-beaked ; pappus white, 

 soft, and abundant. Taraxacum, XVI. 



Akenes nearly as in XVI ; pappus tawny. 



PyiThopappus, XVII. 



Akenes flattened, beaked ; pappus soft, white, the hairs soon 



falling off separately ; leafy-stemmed herbs. 



Lactuca, XVIII. 



Akenes flattened, not beaked ; pappus abundant, soft, white ; 

 leafy-stemmed, spiny-leaved herbs. Sonchus, XIX. 



I. BELLIS, L. 



Small herbs. Leaves usually all radical, petioled. Heads 

 solitary, disk yellow, ray -flowers white or pink ; involucre 

 bell-shaped, bracts in 1 or 2 rows, green ; receptacle conical. 

 Kay -flowers many, in a single row, pistillate. Disk-flowers 

 tubular, perfe(;t, 4-5-toothed ; forks of the style short, thick, 

 tipped by roughened cones. Fruit flattened, obovate ; pappus 

 wanting. 



1. B. integrifolia, Michx. American Daisy. A branching annual 

 or biennial herb, -1-12 in. high. Upper leaves lanceolate or oblong, 

 the lower ones obovate-spatulate. Pleads borne on slender peduncles; 

 rays violet-purple. Prairies, especially S.W. 



2. B. perennis, L. English Daisy, Scotch Daisy. A stem- 

 less perennial. Leaves obovate-spatulate, smooth or hairy. Heads 

 f-1 in. in diameter, very pretty, the rays delicate. Cultivated 

 from Europe. 



n. ERIGERON, L. 



Herbs. Leaves usually sessile. Heads many-flowered, flat 

 or nearly hemispherical, the rays numerQus, narrow, pistillate. 

 Scales of the involucre narrow and overlapping but little. 



