200 COMPOSITE. (COMPOSITE FAMILY.) 



16. BOLTNIA, L'Hei. BOLTONIA 



Heads many-flowered, radiate; the rays numeious, pistillate. Scales of tho 

 hemispherical involucre imbricated somewhat in '2 rows, appressed, with narrow 

 membranaceous margins. Receptacle conical or hemispherical, naked. Ache- 

 nia flat, obovate or inversely heart-shaped, margined with a callous wing, or in 

 the ray 3-wingod, crowned with a pappus of several minute bristles and fre- 

 quently with 2-4 longer awns. Perennial and bushy-branched smooth herbs, 

 pale green, with the aspect of Aster : the thickish leaves chiefly entire. Heads 

 loosely corymbose or panicled : disk yellow : rays white or purplish. (Dedi- 

 cated to /. Bolton, an English botanist.) 



1. B. asteroides, L'Her. Leaves lanceolate; achenia broadly oval; 

 pappus of few minute bristles and no awns. Moist places along streams,, 

 Pennsylvania (Bartram) and southward along the Alleghanies : rare. Oct. 

 Plant usually 6 high. 



2. B. glastifolia, L'Her. Leaves lanceolate, ascending, often turned 

 edgewise by a twist ; achenia obovate, broadly winged ; pappus of several short 

 bristles and, especially in the disk, of 2 or 3 short awns. Rich moist soil, 

 Pennsylvania to Illinois and southward. Sept. Plant 2 - 4 high. 



17. B ELLIS, Tourn. DAISY. 



Heads many-flowered, radiate ; the rays numerous, pistillate. Scales of the 

 involucre herbaceous, equal, in about 2 rows. Receptacle conical, naked. 

 Achenia obovate, flattened, wingless, and without any pappus. Low herbs 

 (all but one species natives of the Old World), either stemless, like the true 

 Daisy, B. perennis, or leafy-stemmed, as is our species. (The Latin name, 

 from bdlus, pretty.) 



1. B. integrifolia, Michx. (WESTERN DAISY.) Diffusely branched 

 and spreading (4' -9' high), smoothish; leaves lanceolate or oblong, the lower 

 spatulate-obovate ; heads on slender peduncles ; rays pale violet-purple. 

 Prairies and banks, Kentucky and southwestward. March - June. 



18. BRACHYCH^ETA, Torr. & Gr. FALSE GOLDEN-ROD. 



Heads and flowers nearly as in Solidago, except the pappus, which is a row 

 of minute rather scale-like bristles shorter than the achenia. A perennial herb, 

 with rounded or ovate serrate leaves, all the lower ones heart-shaped ; the small 

 yellow heads in sessile clusters racemed or spiked on the branches. (Name com- 

 posed of Ppaxvs, short, and X * 1 " 7 /' bristle, from the pappus.) 



1. B. cordata, Torr. & Gr. (Solidago cordata, Short.) Wooded hills, 

 E. Kentucky and southward. Oct. Plant 2 -4 high, slender, more or less 

 pubescent. 



19. SOLIDAGO, L. GOLDEN-KOD. 



Heads few -many-flowered, radiate; the rays 1 to 16, pistillate. Scales of 

 the oblong involucre appressed, destitute of herbaceous tips (except No. 1). 

 Receptacle small, not chaffy Achenia many-iibbed, nearly terete. Pappus 



