242 KEY AXD FLORA 



(d) Akenes ovoid to spindle-shaped, long-beaked, 4-5-ribbed; 



pappus white, soft, and abundant. Taraxacum, XVII 



(e) Akenes nearly as in XYII ; pappus tawny. 



Pyrrhopappus, XXI 

 (/) Akenes not flattened, with or without beak, 10 -ribbed ; pappus 



of abundant stiff, hair-like white bristles. Agoseris, XX 

 (g) Akenes flattened, beaked; pappus soft, white, the hairs soon 



falling off ; leafy-stemmed herbs. Lactuca, XIX 



(h) Akenes flattened, not beaked; pappus abundant, soft, white; 



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



I. TUBULIFLOR^ 



I. BELLIS L. 



Small herbs. Leaves usually all basal, 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, bisexual, 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. 4-12 in. high. Upper leaves lanceolate or oblong, 

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

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



2. B. perennis L. English Daisy, Scotch Daisy. An apparently 

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

 3-1 in. in diameter, very pretty, the rays delicate. Cultivated from 

 Europe. 



II. ERIGERON L. 



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

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

 Scales of the involucre narrow and overlapping but little. 

 Akenes flattish, crowned with a single row of hair-like bristles, 

 or sometimes with shorter bristles or scales outside these. 

 Disk yellow, rays white, x^inkish, or purple. 



B. Fl. species 5 (Leptilon). 



